Bulgaria Turquoise Old Marriage Fashion Jewellery Bracelet Earring Necklace.
By Aamir Mannan.
The refractive index (as measured by sodium light, 589.3 nm) of turquoise is approximately 1.61 or 1.62; this is a mean value seen as a single reading on a gemmological refractometer, owing to the almost invariably polycrystalline nature of turquoise.
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