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Gemological rareities

998 ct Rough Diamond

The Karowe mine has produced a 998-carat diamond, the latest in a string of large rough stones from the lucrative deposit in Botswana. Lucara Diamond Corp., which owns Karowe, will work with manufacturing partner HB Antwerp to assess how to maximize value from the rough, the miner said Wednesday. The unbroken, high-white, clivage stone — …

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Whats The Big Deal With Natural Unheated Sapphires ? 6

Whats The Big Deal With Natural Unheated sapphires ?

Up to 99 % of all Sapphires are heat treated; Sapphires have been treated for centuries by heat to enhance their color and clarity.  The early forms of heat treatment were rudimentary and highly risky involving heat and blow pipes the results were unpredictable and often shattering.  Today we have computer controlled ovens that heat …

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