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Established in 1931, GIA is the world's largest and most respected nonprofit institute of gemological research and learning. Because diamonds are so valuable, GIA believes it is essential for industry professionals to have a universal grading system when comparing diamond quality. It is out of this need that in the mid-twentieth century, GIA developed the International Diamond Grading Systemú and the 4Cs as a way to objectively compare and evaluate diamonds. GIA discovers (through...
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Argyle Diamonds

Since the end of the 19th century, small quantities of diamonds were found in Australia through gold prospecting. Then, 1969 saw the commencement of a systematic exploration of Western Australia, and on October 2, 1979, diamonds were discovered in the Argyle volcanic pipe in the Kimberly Region. Open pit mining began in 1985. The mine is owned by the Anglo-Australian mining giant, Rio Tinto. The Argyle diamond mine is the world’s biggest supplier of diamonds. It yields about 80 percent...
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Diamond Color and Clarity Guide

As with regular diamonds, color and clarity are important factors in determining the value of a color diamond. However, whereas clarity is paramount in determining the value of a colorless diamond, it is the rarity and intensity of color that determines a color diamond’s value. Natural color diamonds can be various shades of: - Yellow - Orange - Red - Pink - Purple - Blue - Green -...
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