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Diamonds (‚Diamanten') bezeichnet: Diamonds (Antigua), Ort im St. Philips Parish, auf der Karibikinsel Antigua. Diamonds (Film), US-amerikanischer Spielfilm. Welcome to Designer Diamonds. Visit us in our branches in Augsburg and Munich. For wedding rings, engagement rings and more! Adenosine, Hydroxypropyl Cyclodextrin, Ascorbic Acid, Diamond Powder, Palmitoyl Tripeptide, Propylene Glycol, Butylene Glycol, Cera Microcristallina,​. By continuing to Beste Spielothek in DГ¶rbach finden www. Mehr lesen…. Ihre E-Mail-Adresse:. Hersteller: Soraya. Check out the link to see the whole interview. Gratis Umsonst und Freizeit:. Die Gesundheit der Mitarbeiter hat Priorität. Belgien BEA. Wir werden versuchen, Ihre Frage so schnell wie möglich zu beantworten. This website uses cookies Market Maker Broker provide you with the best browsing experience. Wandpaneele. Diamonds. EUR / pcs. Ware auf Anfrage erhältlich. Die Wartezeit für die Implementierung beträgt Tage. Anzahl. Created with Sketch. Welcome to Designer Diamonds. Visit us in our branches in Augsburg and Munich. For wedding rings, engagement rings and more! PKOB Wegner wurde mit dem prestigeträchtigen Ranking der Forbes Diamonds ausgezeichnet. Forbes Diamonds ist eines der bekanntesten. Clarte diamonds —. Founded in August in Hamburg, the north German metropolis of creative people, we sell exclusively sustainably produced diamonds.

Diamond Jewellery from F. Hinds As one of Britain's leading high street jewellers, F. With hundreds of diamond engagement rings , diamond eternity rings , diamond three stone rings and diamond dress rings to choose from, F.

Hinds also stocks lots of diamond necklaces and diamond earrings and diamond bracelets choose from, so there really is something for every occasion and all budgets.

Diamond solitaire stud earrings , diamond hoop earrings and diamond drop earrings are some of our best sellers as they make excellent gifts and are affordable enough to treat yourself.

Diamonds become increasingly rare when considering higher clarity gradings. Those that do not have a visible inclusion are known as "eye-clean" and are preferred by most buyers, although visible inclusions can sometimes be hidden under the setting in a piece of jewelry.

Most inclusions present in gem-quality diamonds do not affect the diamonds' performance or structural integrity. When set in jewelry, it may also be possible to hide certain inclusion behind mounting hardware such as prongs in a way that renders the defect invisible.

However, large clouds can affect a diamond's ability to transmit and scatter light. Large cracks close to or breaking the surface may increase the likelihood of a fracture.

The finest quality as per color grading is totally colorless, which is graded as D color diamond across the globe, meaning it is absolutely free from any color.

However, when studded in jewellery these very light colored diamonds do not show any color or it is not possible to make out color shades.

These are graded as E color or F color diamonds. Diamonds which show very little traces of color are graded as G or H color diamonds.

Slightly colored diamonds are graded as I or J or K color. A diamond can be found in any color in addition to colorless. Some of the colored diamonds, such as pink, are very rare.

A chemically pure and structurally perfect diamond is perfectly transparent with no hue , or color. However, in reality most gem-sized natural diamonds are imperfect.

Depending on the hue and intensity of a diamond's coloration, a diamond's color can either detract from or enhance its value.

For example, most white diamonds are discounted in price as a more yellow hue is detectable, while intense pink or blue diamonds such as the Hope Diamond can be dramatically more valuable.

The Aurora Diamond Collection displays a spectacular array of naturally colored diamonds , which occur in every color of the rainbow.

Most diamonds used as gemstones are basically transparent with little tint, or white diamonds. The most common impurity, nitrogen , replaces a small proportion of carbon atoms in a diamond's structure and causes a yellowish to brownish tint.

The GIA has developed a rating system for color in white diamonds, from D to Z with D being "colorless" and Z having a bright yellow coloration , which has been widely adopted in the industry and is universally recognized, superseding several older systems.

The GIA system uses a benchmark set of natural diamonds of known color grade, along with standardized and carefully controlled lighting conditions.

Diamonds with higher color grades are rarer, in higher demand, and therefore more expensive, than lower color grades. Oddly enough, diamonds graded Z are also rare, and the bright yellow color is also highly valued.

N—Y usually appear light yellow or brown. In contrast to yellow or brown hues, diamonds of other colors are more rare and valuable.

While even a pale pink or blue hue may increase the value of a diamond, more intense coloration is usually considered more desirable and commands the highest prices.

A variety of impurities and structural imperfections cause different colors in diamonds, including yellow, pink, blue, red, green, brown, and other hues.

Black diamond's natural form is known as Carbonado , the toughest form of the diamond which is porous and difficult to cut. Black diamonds are natural, man-made, treated black diamonds.

Some black diamonds are expensive than other types of black diamonds because of the quality, durability, production cost, and few other factors.

Intense yellow coloration is considered one of the fancy colors, and is separate from the color grades of white diamonds. Gemologists have developed rating systems for fancy colored diamonds, but they are not in common use because of the relative rarity of such diamonds.

Diamond cutting is the art and science of creating a gem-quality diamond out of mined rough. The cut of a diamond describes the manner in which a diamond has been shaped and polished from its beginning form as a rough stone to its final gem proportions.

The cut of a diamond describes the quality of workmanship and the angles to which a diamond is cut. Often diamond cut is confused with "shape".

There are mathematical guidelines for the angles and length ratios at which the diamond is supposed to be cut in order to reflect the maximum amount of light.

Round brilliant diamonds, the most common, are guided by these specific guidelines, though fancy cut stones are not able to be as accurately guided by mathematical specifics.

The techniques for cutting diamonds have been developed over hundreds of years, with perhaps the greatest achievements made in by mathematician and gem enthusiast Marcel Tolkowsky.

He developed the round brilliant cut by calculating the ideal shape to return and scatter light when a diamond is viewed from above.

The modern round brilliant has 57 facets polished faces , counting 33 on the crown the top half , and 24 on the pavilion the lower half. The girdle is the thin middle part.

The function of the crown is to refract light into various colors and the pavilion's function to reflect light back through the top of the diamond.

The culet is the tiny point or facet at the bottom of the diamond. This should be a negligible diameter, otherwise light leaks out of the bottom.

Tolkowsky's calculations included neither a culet nor a girdle. However, a girdle is required in reality in order to prevent the diamond from easily chipping in the setting.

The thick part of the girdle is normally about 1. The further the diamond's characteristics are from the Tolkowsky's ideal, the less light will be reflected.

However, there is a small range in which the diamond can be considered "ideal". Tolkowsky's calculations can be repeated for a narrow range of pavilion angles.

Such calculations show a slightly larger table percentage, and a trade-off between pavilion angle and crown angle. Today, because of the relative importance of carat weight among buyers, many diamonds are often intentionally cut poorly to increase carat weight.

There is a financial premium for a diamond that weighs the desirable 1. Neither of these changes makes the diamond appear any larger, and both greatly reduce the sparkle of the diamond.

A poorly cut 1. The depth percentage is the overall quickest indication of the quality of the cut of a round brilliant. Another quick indication is the overall diameter.

Typically a round brilliant 1. Mathematically, the diameter in millimeters of a round brilliant should approximately equal to 6.

Diamonds do not show all of their beauty as rough stones; instead, they must be cut and polished to exhibit the characteristic fire and brilliance that diamond gemstones are known for.

Diamonds are cut into a variety of shapes that are generally designed to accentuate these features. Diamonds which are not cut into a round brilliant shape are known as "fancy cuts.

Newer cuts that have been introduced into the jewelry industry are the "cushion" "radiant" similar to princess cuts, but with rounded edges instead of square edges and Asscher cuts.

Many fancy colored diamonds are now being cut according to these new styles. Generally speaking, these "fancy cuts" are not held to the same strict standards as Tolkowsky-derived round brilliants and there are less specific mathematical guidelines of angles which determine a well-cut stone.

Cuts are influenced heavily by fashion: the baguette cut—which accentuates a diamond's luster and downplays its fire—was popular during the Art Deco period, whereas the princess cut — which accentuates a diamond's fire rather than its luster — is currently gaining popularity.

The princess cut is also popular amongst diamond cutters: of all the cuts, it wastes the least of the original crystal.

The past decades have seen the development of new diamond cuts, often based on a modification of an existing cut.

Some of these include extra facets. These newly developed cuts are viewed by many as more of an attempt at brand differentiation by diamond sellers, than actual improvements to the state of the art.

The quality of a diamond's cut is widely considered the most important of the four Cs in determining the beauty of a diamond; indeed, it is commonly acknowledged that a well-cut diamond can appear to be of greater carat weight, and have clarity and color appear to be of better grade than they actually are.

The skill with which a diamond is cut determines its ability to reflect and refract light. In addition to carrying the most importance to a diamond's quality as a gemstone, the cut is also the most difficult to quantitatively judge.

A number of factors, including proportion, polish, symmetry , and the relative angles of various facets, are determined by the quality of the cut and can affect the performance of a diamond.

A diamond with facets cut only a few degrees out of alignment can result in a poorly performing stone. For a round brilliant cut, there is a balance between "brilliance" and "fire".

When a diamond is cut for too much "fire", it looks like a cubic zirconia , which gives off much more "fire" than real diamond. A well-executed round brilliant cut should reflect light upwards and make the diamond appear white when viewed from the top.

An inferior cut will produce a stone that appears dark at the center and in extreme cases the setting may be seen through the top of the diamond as shadows.

Several different theories on the "ideal" proportions of a diamond have been and continue to be advocated by various owners of patents on machines to view how well a diamond is cut.

These advocate a shift away from grading cut by the use of various angles and proportions toward measuring the performance of a cut stone. A number of specially modified viewers and machines have been developed toward this end.

Hearts and Arrows viewers test for the " hearts and arrows " characteristic pattern observable in stones exhibiting high symmetry and particular cut angles.

Closely related to Hearts and Arrows viewers is the ASET which tests for light leakage, light return, and proportions. Detractors, however, see these machines as marketing tools rather than scientific ones.

The GIA has developed a set of criteria for grading the cut of round brilliant stones that is now the standard in the diamond industry and is called Facetware.

The process of shaping a rough diamond into a polished gemstone is both an art and a science. The choice of cut is often decided by the original shape of the rough stone, location of the inclusions and flaws to be eliminated, the preservation of the weight, popularity of certain shapes amongst consumers and many other considerations.

Oddly shaped crystals such as macles are more likely to be cut in a fancy cut —that is, a cut other than the round brilliant—which the particular crystal shape lends itself to.

Since the per carat price of diamond shifts around key milestones such as 1. Some jewelry experts advise consumers to buy a 0.

In the gem trade, the term light performance is used to describe how well a polished diamond will return light to the viewer. There are three light properties which are described in relation to light performance: brilliance, fire, and scintillation.

Brilliance refers to the white light reflections from the external and internal facet surfaces. Fire refers to the spectral colors which are produced as a result of the diamond dispersing the white light.

Scintillation refers to the small flashes of light that are seen when the diamond, light source or the viewer is moved. A diamond that is cut and polished to produce a high level of these qualities is said to be high in light performance.

The setting diamonds are placed in also affect the performance of light through a diamond. The three most commonly used settings are: Prong, Bezel, and Channel.

Prong settings are the most popular setting for diamond jewelry. Mined rough diamonds are converted into gems through a multi-step process called "cutting".

Diamonds are extremely hard, but also brittle and can be split up by a single blow. Therefore, diamond cutting is traditionally considered as a delicate procedure requiring skills, scientific knowledge, tools and experience.

Its final goal is to produce a faceted jewel where the specific angles between the facets would optimize the diamond luster, that is dispersion of white light, whereas the number and area of facets would determine the weight of the final product.

For example, the diamond might be intended for display or for wear, in a ring or a necklace, singled or surrounded by other gems of certain color and shape.

Some of them are special, produced by certain companies, for example, Phoenix , Cushion , Sole Mio diamonds, etc.

The most time-consuming part of the cutting is the preliminary analysis of the rough stone. It needs to address a large number of issues, bears much responsibility, and therefore can last years in case of unique diamonds.

The following issues are considered:. After initial cutting, the diamond is shaped in numerous stages of polishing.

Unlike cutting, which is a responsible but quick operation, polishing removes material by gradual erosion and is extremely time consuming.

The associated technique is well developed; it is considered as a routine and can be performed by technicians.

Those flaws are concealed through various diamond enhancement techniques, such as repolishing, crack filling, or clever arrangement of the stone in the jewelry.

Remaining non-diamond inclusions are removed through laser drilling and filling of the voids produced. And the firm created new markets in countries where no diamond tradition had existed before.

Ayer's marketing included product placement , advertising focused on the diamond product itself rather than the De Beers brand, and associations with celebrities and royalty.

Without advertising the De Beers brand, De Beers was advertising its competitors' diamond products as well, [] but this was not a concern as De Beers dominated the diamond market throughout the 20th century.

De Beers still advertises diamonds, but the advertising now mostly promotes its own brands, or licensed product lines, rather than completely "generic" diamond products.

Brown-colored diamonds constituted a significant part of the diamond production, and were predominantly used for industrial purposes. They were seen as worthless for jewelry not even being assessed on the diamond color scale.

After the development of Argyle diamond mine in Australia in , and marketing, brown diamonds have become acceptable gems.

Industrial diamonds are valued mostly for their hardness and thermal conductivity, making many of the gemological characteristics of diamonds, such as the 4 Cs , irrelevant for most applications.

The boundary between gem-quality diamonds and industrial diamonds is poorly defined and partly depends on market conditions for example, if demand for polished diamonds is high, some lower-grade stones will be polished into low-quality or small gemstones rather than being sold for industrial use.

Within the category of industrial diamonds, there is a sub-category comprising the lowest-quality, mostly opaque stones, which are known as bort.

Industrial use of diamonds has historically been associated with their hardness, which makes diamond the ideal material for cutting and grinding tools.

As the hardest known naturally occurring material, diamond can be used to polish, cut, or wear away any material, including other diamonds.

Common industrial applications of this property include diamond-tipped drill bits and saws, and the use of diamond powder as an abrasive.

Less expensive industrial-grade diamonds, known as bort, with more flaws and poorer color than gems, are used for such purposes.

Specialized applications include use in laboratories as containment for high-pressure experiments see diamond anvil cell , high-performance bearings , and limited use in specialized windows.

The high thermal conductivity of diamond makes it suitable as a heat sink for integrated circuits in electronics.

The mining and distribution of natural diamonds are subjects of frequent controversy such as concerns over the sale of blood diamonds or conflict diamonds by African paramilitary groups.

Only a very small fraction of the diamond ore consists of actual diamonds. The ore is crushed, during which care is required not to destroy larger diamonds, and then sorted by density.

Today, diamonds are located in the diamond-rich density fraction with the help of X-ray fluorescence , after which the final sorting steps are done by hand.

Before the use of X-rays became commonplace, [96] the separation was done with grease belts; diamonds have a stronger tendency to stick to grease than the other minerals in the ore.

Historically, diamonds were found only in alluvial deposits in Guntur and Krishna district of the Krishna River delta in Southern India.

Diamond extraction from primary deposits kimberlites and lamproites started in the s after the discovery of the Diamond Fields in South Africa.

Most of these mines are located in Canada, Zimbabwe, Angola, and one in Russia. In the U. The Crater of Diamonds State Park in Arkansas is open to the public, and is the only mine in the world where members of the public can dig for diamonds.

In some of the more politically unstable central African and west African countries, revolutionary groups have taken control of diamond mines , using proceeds from diamond sales to finance their operations.

Diamonds sold through this process are known as conflict diamonds or blood diamonds. In response to public concerns that their diamond purchases were contributing to war and human rights abuses in central and western Africa, the United Nations , the diamond industry and diamond-trading nations introduced the Kimberley Process in This is done by requiring diamond-producing countries to provide proof that the money they make from selling the diamonds is not used to fund criminal or revolutionary activities.

Although the Kimberley Process has been moderately successful in limiting the number of conflict diamonds entering the market, some still find their way in.

This is a stringent tracking system of diamonds and helps protect the "conflict free" label of Canadian diamonds. Synthetic diamonds are diamonds manufactured in a laboratory, as opposed to diamonds mined from the Earth.

The gemological and industrial uses of diamond have created a large demand for rough stones. This demand has been satisfied in large part by synthetic diamonds, which have been manufactured by various processes for more than half a century.

However, in recent years it has become possible to produce gem-quality synthetic diamonds of significant size. The majority of commercially available synthetic diamonds are yellow and are produced by so-called high-pressure high-temperature HPHT processes.

Other colors may also be reproduced such as blue, green or pink, which are a result of the addition of boron or from irradiation after synthesis.

Another popular method of growing synthetic diamond is chemical vapor deposition CVD. The growth occurs under low pressure below atmospheric pressure.

It involves feeding a mixture of gases typically 1 to 99 methane to hydrogen into a chamber and splitting them to chemically active radicals in a plasma ignited by microwaves , hot filament , arc discharge , welding torch or laser.

A diamond simulant is a non-diamond material that is used to simulate the appearance of a diamond, and may be referred to as diamante.

Cubic zirconia is the most common. The gemstone moissanite silicon carbide can be treated as a diamond simulant, though more costly to produce than cubic zirconia.

Both are produced synthetically. Diamond enhancements are specific treatments performed on natural or synthetic diamonds usually those already cut and polished into a gem , which are designed to better the gemological characteristics of the stone in one or more ways.

These include laser drilling to remove inclusions, application of sealants to fill cracks, treatments to improve a white diamond's color grade, and treatments to give fancy color to a white diamond.

Coatings are increasingly used to give a diamond simulant such as cubic zirconia a more "diamond-like" appearance.

One such substance is diamond-like carbon —an amorphous carbonaceous material that has some physical properties similar to those of the diamond.

Advertising suggests that such a coating would transfer some of these diamond-like properties to the coated stone, hence enhancing the diamond simulant.

Techniques such as Raman spectroscopy should easily identify such a treatment. Early diamond identification tests included a scratch test relying on the superior hardness of diamond.

This test is destructive, as a diamond can scratch another diamond, and is rarely used nowadays. Instead, diamond identification relies on its superior thermal conductivity.

Electronic thermal probes are widely used in the gemological centers to separate diamonds from their imitations.

These probes consist of a pair of battery-powered thermistors mounted in a fine copper tip. One thermistor functions as a heating device while the other measures the temperature of the copper tip: if the stone being tested is a diamond, it will conduct the tip's thermal energy rapidly enough to produce a measurable temperature drop.

This test takes about two to three seconds. Whereas the thermal probe can separate diamonds from most of their simulants, distinguishing between various types of diamond, for example synthetic or natural, irradiated or non-irradiated, etc.

Those techniques are also used for some diamonds simulants, such as silicon carbide, which pass the thermal conductivity test. Optical techniques can distinguish between natural diamonds and synthetic diamonds.

They can also identify the vast majority of treated natural diamonds. Laboratories use techniques such as spectroscopy, microscopy and luminescence under shortwave ultraviolet light to determine a diamond's origin.

Several methods for identifying synthetic diamonds can be performed, depending on the method of production and the color of the diamond.

CVD diamonds can usually be identified by an orange fluorescence. Screening devices based on diamond type detection can be used to make a distinction between diamonds that are certainly natural and diamonds that are potentially synthetic.

Those potentially synthetic diamonds require more investigation in a specialized lab. Occasionally, large thefts of diamonds take place.

The gang broke through a perimeter fence and raided the cargo hold of a Swiss-bound plane. The gang have since been arrested and large amounts of cash and diamonds recovered.

The identification of stolen diamonds presents a set of difficult problems. Rough diamonds will have a distinctive shape depending on whether their source is a mine or from an alluvial environment such as a beach or river—alluvial diamonds have smoother surfaces than those that have been mined.

Determining the provenance of cut and polished stones is much more complex. The Kimberley Process was developed to monitor the trade in rough diamonds and prevent their being used to fund violence.

Before exporting, rough diamonds are certificated by the government of the country of origin. Some countries, such as Venezuela, are not party to the agreement.

The Kimberley Process does not apply to local sales of rough diamonds within a country. Diamonds may be etched by laser with marks invisible to the naked eye.

Lazare Kaplan , a US-based company, developed this method. However, whatever is marked on a diamond can readily be removed.

Diamonds have been treasured as gemstones since their use as religious icons in ancient India. Their usage in engraving tools also dates to early human history.

In , the French scientist Antoine Lavoisier used a lens to concentrate the rays of the sun on a diamond in an atmosphere of oxygen , and showed that the only product of the combustion was carbon dioxide , proving that diamond is composed of carbon.

From Wikipedia, the free encyclopedia. This article is about the mineral. For the gemstone, see Diamond gemstone.

Allotrope of carbon often used as a gemstone and an abrasive. The slightly misshapen octahedral shape of this rough diamond crystal in matrix is typical of the mineral.

Its lustrous faces also indicate that this crystal is from a primary deposit. Main article: Material properties of diamond. See also: Crystallographic defects in diamond.

Main article: Diamond color. Main article: Extraterrestrial diamonds. A round brilliant cut diamond set in a ring.

Main article: Diamond gemstone. Main articles: Diamond cutting and Diamond cut. See also: List of diamond mines and Exploration diamond drilling.

Play media. Main articles: Kimberley Process , Blood diamond , and Child labour in the diamond industry. Main article: Synthetic diamond.

Main article: Diamond simulant. Main article: Diamond enhancement. Minerals portal. Retrieved July 7, In Delhaes, Pierre ed. Graphite and precursors.

Noyes Publications. In Paoletti, A. The physics of diamond. IOS Press. Chemical Thermodynamics. University Science Books. Popular Science. Retrieved October 31, In Yang, Guowei ed.

Pan Stanford Pub. Physical Review Letters. Bibcode : PhRvL.. January 23, Proceedings of the National Academy of Sciences.

Bibcode : PNAS.. Materials science. Tata McGraw-Hill Pub. David Solid state physics. Holt, Rinehart and Winston. In Radovic, Ljubisa R. Chemistry and physics of carbon.

Marcel Dekker. Gems: Their sources, descriptions and identification 5th ed. Great Britain: Butterworth-Heinemann. May 30, Annual Review of Earth and Planetary Sciences.

Diamond and Related Materials. Bibcode : DRM Astrophysical Journal. Bibcode : ApJ National Science Foundation. January 8, Retrieved October 28, Properties, Growth and Applications of Diamond.

Institution of Engineering and Technology. Innovative superhard materials and sustainable coatings for advanced manufacturing. Handbook of ceramic grinding and polishing.

William Andrew. The nature of diamonds. Cambridge University Press. October 3, Applied Physics Letters. Nature Communications. Bibcode : NatCo Physics World.

November 2, Retrieved November 1, April 20, Philosophical Transactions of the Royal Society A. Bibcode : ApPhL.. Redox activity".

Physical Review E. Bibcode : PhRvE.. Analytical Chemistry. Precious Stones, Volume 1. Dover Publications. Gemological Institute of America. Retrieved August 1, How to Safeguard Your Jewelry".

Science Questions with Surprising Answers. February 21, European Journal of Inorganic Chemistry. Physical Review B.

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