Deutsch
"In general, major remarks are confined to the synthesis of corundum but also include comments on synthetic quartz, opal, emerald, and diamond [...]. Amplifying remarks in part four discuss color in natural gemstones, distinctions between synthetic and natural gemstones, properties of synthetic diamonds (!) and including their combustion, and prices of synthetic stones."--Gemology by J. Sinkankas, entry no. 856.
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