Why Lab-Grown Diamonds Can Temporarily Change Color
It's long been known that some CVD diamonds will temporarily change color under the “right” conditions. A 2010 Gems & Gemology article reported that the “color of as-grown [non-treated] CVD synthetic diamond gemstones may not be stable,” and that, if subject to ultraviolet radiation or high temperatures, “as-grown CVDs can show large, reversible changes in color.” It notes that these changes don’t cause any structural damage, and adds that, with exposure to sunlight, the stone will return to its original look.
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