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TanzaniteOne traditionally sell only rough gemstones to wholesale customers called "Sightholders", [2] adopting a sales strategy which is based on the Debeers style of distribution where the sightholder companies are guaranteed a consistent bulk supply of the gemstone, but must purchase all quality grades of the gem as opposed to selecting the ...
What was to become the Israeli diamond industry began in 1937, eleven years before the State of Israel was established, when the first diamond polishing plant was opened in Petah Tikva by Asher Anshel Daskal and Zvi Rosenberg, two experts diamantaires from Romania that immigrated from Belgium. [4] In 1938 the 15% import duty on imported rough stones was removed. By 1944 the industry employed ...
Diamond[a] is a gemstone formed by cutting a raw diamond. Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times. The hardness of diamond and its high dispersion of light —giving the diamond its characteristic "fire"—make it useful for industrial applications and ...
The Diamond Trading Company (DTC) is the rough diamond sales and distribution arm of the De Beers Group. The DTC sorts, values and sells about 35% of the world’s rough diamonds by value. [1]
Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Diamond as a form of carbon is a tasteless, odourless, strong, brittle solid, colourless in pure form, a poor conductor of electricity, and insoluble in water. Another solid form of carbon known as graphite is the chemically stable ...
Untreated tanzanite is a trichroic gemstone, meaning that light that enters this anisotropic crystal gets refracted on different paths, with different colour absorption on each of the three optical axes.
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