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Archive for the "Coloured Stone Guide" Category

Rough Emerald

Coloured Stone Guide – Emeralds

October 3 2020

Belonging to the beryl family
┬áThe 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…

Sapphire and diamond ring

Coloured Stone Guide – Sapphires

September 3 2020

So 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 …

Unusual Corundum Doublet

An Unusual Corundum Doublet

August 3 2020

Summary of ‘A Lead-Glass-Filled Corundum Doublet’ by Supparat Promwongnan,┬áThanong Leelawatanasuk and Saengthip Saengbuangamlam.

This Gemmological Brief describes a 1. …