or creating syn- thetic gems over the past hundred years. Auguste Verneuil’s flame-fusion process involves dropping powdered chemicals through a high-temperature flame onto a rotating pedestal that’s slowly lowered as cooling and crystallization take place. With it, Verneuil was the first to successfully create a product that could be marketed as a synthetic gem of suitable quality for jewelry. Flame fusion is still the most common and least expensive synthetic gem production method.

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