Subject 01 · 2 articles
Gemstones & Minerals
In-depth guides to individual stones and their varieties: how they form, what they are made of, where they come from, and how to tell one from another.
Showing 1-2 of 2 articles
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Corundum
Sapphire: The Many Colors of Corundum
A complete guide to natural sapphire: the chemistry behind its many colors, the world's major deposits, treatments and synthetics, and the famous stones and record crystals behind its reputation.
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Corundum
Kashmir Sapphires: The Legend of the Blue Treasure
Why Kashmir sapphires outprice every other blue: the legendary Paddar mines, the science behind the velvety cornflower blue, and the records they set at auction.
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