Guides and interactive explainers on gemstones, diamonds, metals and making jewellery, written for people in the trade and checked against named sources.
Tagged “coloured-stones” · Clear
Gemstones & diamonds
Copper-coloured neon tourmaline from Brazil, Nigeria, Mozambique and now Ethiopia: how the name is defined, how labs tell origins apart, treatments, and what to check before you buy.
8 Oct 2026
Gemstones & diamonds
Properties, colour, quality, treatments, synthetics, origin reports, weight estimation, setting and care of sapphire: the facts that matter when you buy, set and sell it.
6 Oct 2026
Treatments & disclosure
Heating, oiling, filling, diffusion, irradiation and more: which stones are usually treated, what that means for care at the bench, and how to disclose it honestly.
5 Oct 2026
Gemstones & diamonds
What each section of a diamond grading report and a coloured stone report means, what a report does not tell you, and how to check it matches the stone.
5 Oct 2026
Business & trade
How Thailand's two great gem centres work, what to expect on a first buying trip, and the habits that keep a new buyer safe.
5 Oct 2026
