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Internet Search Results     Natural Diamonds | Diamond Stone – GIA C Get to know all you need about diamond – the history, facts, quality factors, treatments, imitations and much more here at GIA. Diamond History and Lore The world’s love of diamonds had its start in India, where diamonds were gathered from the country’s rivers and streams. Some historians estimate that India was trading in diamonds as early as the fourth century BC. Diamond Description Diamond’s characteristic chemical composition and crystal structure make it a unique member of the mineral kingdom. Diamond is the only gem made of a single element: It is typically about 99.95 percent carbon. The other 0.05 percent can include one or more trace elements, which are atoms that aren’t part of the diamond’s essential chemistry. Diamond - Gemological Institute of America Diamond Most diamonds formed more than a billion years ago! They form about 100 miles (161 kilometers) below the earth’s surface, where the temperature and pressure are just right. Diamonds are the hardest natural material on earth. They stand for fearlessness and invincibility, and are a symbol of love. The Extraordinary Backstory of Natural Diamonds: A Diamond Is (and Has ... Diamond growth may occur somewhat quickly compared to its age, building up a crystal layer by layer over thousands or perhaps millions of years. The subsequent period of mantle residence at conditions of high pressure and temperature can permit changes in the diamond morphology, internal structure, and atomic-scale defects. Diamond Fun Facts Diamond crystals are brought closer to the Earth’s surface through volcanic activity. Diamonds can be found in shallow alluvial deposits where the crystals settle after being transported away from the kimberlite pipes by geologic activity and rivers. Around 30 percent of the diamonds mined worldwide are gem-quality. Gemological Institute Of America | All About Gemstones - GIA Established in 1931, GIA is an independent nonprofit that protects the gem and jewelry buying public through research, education and laboratory services. GIA Diamond Origin Diamond mining is the largest private sector employer in Lesotho, employing thousands. The Lesotho mines, the most famous of which is the Letšeng mine – legendary for its massive, high-quality colorless diamonds – use technically advanced equipment for diamond extraction and trains local workers in computers and X-ray technology. 天然钻石 | 钻石 - GIA 钻石只在地球表面之下大约 100 英里的高温和高压条件下形成。 钻石的碳原子在所有方向上的键合都基本相同。 另一种矿物 - 石墨，同样也仅包含碳，但其形成过程和晶体结构却大不相同。 石墨十分柔软，您可以用它写字，而钻石则十分坚硬，两块钻石相刻仅仅产生刮痕。 钻石描述 钻石的历史与 ... Diamond Quality Factors Diamond is available in a range of sizes and qualities to fit every consumer's tastes. One of the first things most people learn about diamonds is that not all diamonds are created equal. In fact, every diamond is unique. Diamonds come in many sizes, shapes, colors, and with various internal characteristics. All polished diamonds are valuable. That value is based on a combination of factors ...      Live EBAY Auctions                          * Latest Diamond Rings 101 News *         *** News Filter: "Diamond-Brilliance"                          >> Sorry... the news is not available now.        Please try again later... 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