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2,237 questions

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132,357 users

Stone changes color in UV light from my diamond tester

0 votes

Hi, hoping someone can help me. I just purchased a ring - 18k white gold with a blue stone in the center. Seller thought it might be blue topaz but I thought it had a bit too much "fire" to be a topaz. I was testing the stones around it and flipped the switch to ultraviolet. When the light hit the blue stone, it turned it pink. Any idea what I have?

Thanks so much

asked May 19, 2012 by Linda Lamp (120 points)

1 Answer

0 votes

Could be blue zircon. Zircon has more fire than topaz and also may be fluorescent. See if you notice any double refraction (you may need a loupe).

answered May 21, 2012 by hershel (52,820 points)