57769560_s_Facet_Rough___PrettyRock_com__Fact
[#] 4 [Myth] All you need is a refractometer to identify gemstones. [Fact] 
A refractometer is very helpful, since the refractive index (RI) is very unique for gemstones. But the caveats include: Some stones are very close to each other by RI. Some stones can range broadly as the impurities are different from locality to locality. Some stones are off the scale, over RI 1.80 for most refractometers. The refractometer cannot detect synthetics or treatment which you need to know.
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Fact