JTV described the smoke treatment process on their website. "In the smoke treatment process, the opals are wrapped in silver foil paper and heated. The smoke penetrates the opal and darkens the background color. This process results in a brighter play-of-colors in contrast to the darkened background color."
Although other black opals are on the market, there are few with the dazzling range of colors that come with Chalama Black Opals. If you're a fan of opal jewelry, you may want to check out a couple of vintage jewelry items that might strike your fancy.
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