Coloured Stone Guide – Emeralds
October 3 2020Belonging to the beryl family
The third stone in this series on the more well-known (and sometimes lesser known) gemstones covers emerald. In the same way as ruby and sapphire w…
Archive for the "Coloured Stone Guide" Category
Coloured Stone Guide – Sapphires
September 3 2020So what is sapphire?
Sapphire and ruby are basically the same stone, corundum, which, as we saw, is comprised of aluminium and oxygen. The difference with sapphire though is that …
An Unusual Corundum Doublet
August 3 2020Summary of ‘A Lead-Glass-Filled Corundum Doublet’ by Supparat Promwongnan, Thanong Leelawatanasuk and Saengthip Saengbuangamlam.
This Gemmological Brief describes a 1. …