Guides and interactive explainers on gemstones, diamonds, metals and making jewellery, written for people in the trade and checked against named sources.
Tagged “sapphire” · Clear
Treatments & disclosure
Why corundum is heated, what heating changes inside a stone, how laboratories detect and word it, and how heating differs from diffusion and glass filling.
6 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
