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Yellow sapphire’s attractive color is just one reason for this gemstone’s popularity. As with all sapphire, it’s also extremely durable, having a hardness of 9 on the Mohs scale. Sapphire has a specific gravity of 4.00, a refractive index of 1.76 – 1.78, and birefringence of 0.008.  The refractive index (RI), measured using a refractometer, is an indication of the amount light rays are bent by a mineral. Birefringence is the difference between the minimum and maximum RI. When birefringence is high, light rays reflect off different parts of the back of a stone causing an apparent doubling of the back facets when viewed through the front facet.


Bankok, Sillone


1 Caret, 2 Caret, 3 Caret, 4 Caret, 5 Caret, 6 Caret, 7 Caret, 8 Caret, 9 Caret


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