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https://www.nrc.gov/reading-rm/doc-collections/fact-sheets/irradiated-gemstones.html
Jan 06, 2021 · Some gemstones are exposed to radiation to enhance or change their color. Topaz is the most commonly treated stone. Typically orange, topaz becomes blue after it has been exposed. Diamonds and other precious gems may also be treated with radiation. This process of irradiation can make the gems slightly radioactive.
https://www.firemountaingems.com/shop/kwlowinv-topaz-irradiated
Bead, sky blue topaz (irradiated), 8x6mm-10x8mm hand-cut top-drilled micro-faceted teardrop with 0.4-1.4mm hole, C grade, Mohs hardness 8. Sold per pkg of 16.
https://public-blog.nrc-gateway.gov/2014/12/08/blue-topaz-the-irradiated-gemstone/
Dec 08, 2014 · Topaz is not the only gemstone treated with radiation to change its color. Diamonds, pearls and other gemstones are sometimes irradiated to change their color. In general, the longer stones are exposed to radiation, the deeper and more attractive the color. Incidentally, not all radiation treatments applied to gemstones make them radioactive.Estimated Reading Time: 3 mins
https://www.gemsociety.org/article/topaz-jewelry-and-gemstone-information/
Jan 20, 2020 · Due to topaz’s perfect cleavage, don’t use ultrasonic or steam systems to clean them. Both vibrations and heat could cause these gems to split. Instead, use a soft brush, mild detergent, and warm water. Some prongs can place stress on topaz’s cleavage plane. However, an expert custom jewelry maker can set this stone properly to avoid stress.Luster: Vitreous
https://www.gemselect.com/gem-info/irradiation.php
Dec 16, 2006 · So exposing topaz to radiation induces color changes by modifying the way in which the crystal structure absorbs frequencies of light. Depending on the duration and type of irradiation, and the sort of heating process used afterward, the results vary from light sky blue, to medium Swiss blue and darker London blue.
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