Verneuil method
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The Verneuil method, also called flame fusion, was the first commercially successful method of manufacturing synthetic gemstones, developed in late 1883 by the French chemist Auguste Verneuil. It is p
A small ruby boule, still attached to the rod, produced by the Verneuil process
Corundum
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Corundum is a crystalline form of aluminium oxide typically containing traces of iron, titanium, vanadium, and chromium. It is a rock-forming mineral. It is a naturally transparent material, but can h
Verneuil method
…gemstones, developed in late 1883 by the French chemist Auguste Verneuil. It is primarily used to produce the ruby, sapphire and padparadscha varieties of corundum, as well as the diamond simulants rutile, strontium titanate and spinel. The principle of the process involves melting a finely powdered substance using…
Several corundum crystals
Corundum from Brazil, size about 2 cm × 3 cm (0.8 in × 1 in)