Tagged “commonly-treated”
Entries across every discipline that share this thread.
Aquamarine
The sea-blue variety of beryl — emerald's clearer, hardier cousin, coloured by iron.
GemstoneCitrine
The yellow-to-orange variety of quartz — November's warm birthstone, most of it heat-made from amethyst.
GemstoneEmerald
The green variety of beryl — valued for its vivid colour despite near-universal inclusions.
GemstoneRuby
The red variety of corundum — second only to diamond in hardness, and coloured by chromium.
GemstoneSapphire
Corundum in every colour but red — famed for its blue, and prized for durability.
GemstoneTanzanite
A blue-violet zoisite found in just one place on Earth — heat-treated and pleochroic.
GemstoneTopaz
A hard aluminium fluorosilicate spanning colourless to imperial orange — with a notable cleavage to respect.
GemstoneTurquoise
A sky-blue copper phosphate valued for millennia — soft, porous and often stabilised.