This pocket sized gemologists gemmological tool simultaneously shows a pleochroic gem's pleochroic colours side by side in sharp contrast. It is used in gemology to quickly separate similar looking stones like rubies from garnets, red spinels and glass by detecting if they are non pleochroic, dichroic or trichroic. It can also be used in a series of tests to aid in the identification of gems.
16 июл 2024
