Gemological rareities

Whats The Big Deal With Natural  Unheated sapphires ? 5

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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