Beryllium treatment for Sapphires

The Carlsbad laboratory recently received a 4.25 ct transparent orange oval mixed-cut stone (figure 1) for a colored stone identification report. Standard gemological testing established the following properties: RI—1.762 to 1.770; birefringence—0.008; optic sign—uniaxial negative; pleochroism—strong orange and very light yellow; and SG—3.98. All of these properties are consistent with both natural and synthetic sapphire

Beryllium treatment for Orange Sapphires
Article by GIA


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