Values of the Refractive Index and Specific Gravity of Commercially Known Gemstones.

The GAA has provided this A4, colour, eight page, wire bound, laminated and durable brochure that is easy to use; it will prove an invaluable tool to all existing and budding Gemmologists. With tabulated categories such as ‘Gems listed in Alphabetical Order’, Gems listed in order of Increasing Refractive Index’ & ‘Gems listed in order of Increasing Specific Gravity’, it will be easy to find the information you require.