Guides and interactive explainers on gemstones, diamonds, metals and making jewellery, written for people in the trade and checked against named sources.
The words you may and may not use for laboratory-grown diamonds in the US, UK, EU, France, Belgium, India, Russia and China, with the 2025 and 2026 changes: India's new standard, Russia's "synthetic" rule, GIA's new reports and CIBJO's vote.
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
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