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(Total 1 Products for Black Sapphire Factory Price)
Wholesale Natural Gemstone Beads Large Stock
Sapphires may be treated by several methods to enhance and improve their clarity and color. It is common practice to heat natural sapphires to improve or enhance color. This is done by heating the sapphires in ovens to temperatures between 500 and 1800 °C for several hours, or by heating in a nitrogen-deficient...
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