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Merfolk Jewels - Vintage Jewelry on Instagram: "Here I have a lab-created ruby and an earth-mined ruby, both set in 10k yellow gold. If you’ve ever shopped for or owned a ruby, you might know that most high-quality ones fluoresce strongly under UV light. But why? And why does this matter? Most bright red rubies contain the trace element chromium, which gives them their red color. Chromium absorbs ultraviolet light and re-emits it as red light, which makes rubies appear to glow under a UV flashli
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