A Gemological Refractometer is your primary and most powerful tool in gemstone identification. As with any typical critical angle refractometer, it will measure the Refractive Index of faceted stones, transparent to near opaque, whether loose or mounted (in many cases), up to an R. I. value of 1.81.

How do you analyze gemstones?

Gemologists make use of tools including jeweler's microscopes, loupes, or measurement of the refractive index in order to identify synthetic gemstones or those that have been improved. A jeweler's loupe is a magnifying device that allows inclusions and blemishes to be seen.

What is gem testing?

Gem Testing Report. IDT assess and scrutinize the characteristics of a mounted or loose coloured stone ( description, weight, measurements, shape, cutting style and colour) with our advanced state of the art testing equipments.