How to ascertain the identity of common coloured gemstones

Here in this video, we demonstrated how to ascertain the identity of common coloured gemstones in 2 simple steps! First by using the Presidium Gem Indicator (PGI) to first test on the gemstone, and then using the Refractive Index Meter II (PRIM II) to further narrow down the gemstone's identity.

Видео How to ascertain the identity of common coloured gemstones канала Presidium Instruments