Guides and interactive explainers on gemstones, diamonds, metals and making jewellery, written for people in the trade and checked against named sources.
Tagged “lab-reports” · 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
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
