Metals & making
Casting porosity: telling gas, shrinkage and investment apart
How to recognise the main kinds of porosity in jewellery castings, what usually causes each, and the checks and changes that prevent them.
6 Oct 2026
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Guides and interactive explainers on gemstones, diamonds, metals and making jewellery, written for people in the trade and checked against named sources.
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Metals & making
Casting weight: calculating the metal from wax or resin
The one formula behind every casting weight chart, worked examples for gold, silver and platinum, and how much to add for sprues and the button.
5 Oct 2026