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Articles by Martin Rapaport. Rapaport Diamond Prices Video. Rapaport Single Stone Auction. All rights reserved.

While the information presented is from sources we believe reliable, we do not guarantee the accuracy or validity of any information presented by Rapaport or the views expressed by users of our internet service.

Dubai, China Establish Diamond Partnership. Pandemic Pinches Luk Fook Revenue. Rapaport Price Calculator - Price Diamonds online and on the go.

Price Change Gold. Rate Change Euro. Each month, the Rapaport Research Report reviews the state of global rough, polished and retail markets and takes an in-depth look at key issues affecting the diamond industry.

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.

See also: Diamond gemstone. 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. Bibcode : PhRvB.. Reports on Progress in Physics.

Bibcode : RPPh Brunswick House Press. The Daily Telegraph. Retrieved March 31, May 12, Retrieved May 13, The diamond makers. Synthetic, Imitation and Treated Gemstones.

Gulf Professional Publishing. Dan December 1, The Mantle and Core. Archived from the original PDF on October 21, Retrieved June 16, They don't form from coal!

Geology and Earth Science News and Information. Archived from the original on October 30, Retrieved June 29, The Christian Science Monitor.

Retrieved August 30, Economic Geology: Principles and Practice. A dictionary of geology and earth sciences 4th ed.

Oxford: Oxford University Press. In Milkereit, B. Decennial Mineral Exploration Conferences , Retrieved March 1, Washington, DC.

Retrieved December 13, In Orcutt, Beth N. July 12, Reviews of Modern Physics. Bibcode : RvMP October 1,

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