Gemstone guides
Detailed guides
Detailed guides: species, hardness, origins, cuts and care.
- DiamondDiamond guide: pure carbon, Mohs hardness 10, the 4Cs, deposits from Botswana to Russia, recommended cuts and care advice. Design your own diamond jewellery.
- SapphireSapphire guide: mineral species, Mohs hardness 9, main deposits, the most flattering cuts and care advice. Design your own sapphire jewellery.
- EmeraldEmerald guide: green beryl, hardness 7.5 to 8, Colombian and Zambian deposits, the emerald cut and care precautions. Design your own emerald jewellery.
- RubyRuby guide: red corundum, Mohs hardness 9, Burmese and Mozambican deposits, recommended cuts and care advice. Design your own ruby jewellery.