Gem select; refractive index chart; dec. 2007, Refractive index chart. refractive index, or ri as it is often abbreviated, is one of the most important signatures of a gemstone. measuring the refractive index is. Pearl reports & services - gemological institute america, 11111pearl identification report pearl identification report. details quantity, weight, size, shape, color, origin, mollusk, environment and detectable. Rocks, gems minerals – gem guides book , 2 rocks, gems, and minerals (a falcon guide), romaine. an accessible field guide to 80 of the most common and sought-after rocks, gems and minerals in north america.

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