Craft13 Jul 20268 min readSuper Admin
Sri Lanka Sapphire Mining & Gem Cutting
From Ratnapura gem gravel pits to the faceting wheel — how Ceylon sapphires are mined, sorted, and cut.
- Sapphire
- Origin
- Mining
Journal
Notes from the House
Gemstone guides, trade insights, and stories from our world.
Coloured gemstones for the Ceylon Gems London journalCraft
Provenance12 Jul 20268 min readSuper Admin
Padparadscha Sapphire: Defining a Contested Colour Term
The padparadscha designation requires a subtle pink-orange balance — laboratory standards differ and buyer diligence is essential.
- Sapphire
Education11 Jul 20265 min readSuper Admin
How to Read a Coloured Stone Laboratory Report
GIA, Gübelin, SSEF, and Lotus each use consistent conventions — learn what identification, enhancement, and origin sections mean.
- Laboratory Reports
Education7 Jul 20267 min readSuper Admin
Heat Treatment in Ruby and Sapphire: A Practical Guide for Buyers
Heat treatment is widespread in corundum. Here is how to interpret disclosure, pricing, and laboratory wording.
- Treatment
Education30 Jun 20266 min readSuper Admin
Understanding Ceylon Sapphire: Colour, Crystal, and Geographic Origin
How gemmologists evaluate blue sapphire from Sri Lanka — and why origin alone never replaces proper examination.
- Sapphire
- Origin