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https://www.gia.edu/opal-care-cleaning
Opals can be treated by impregnation with oil, wax, or plastic, and by surface modifications called sugar treatment and smoke treatment.
https://www.gemsociety.org/article/clean-pearls-opals/
How To Clean Opal and Pearl Jewelry. Never clean opal or pearl jewelry in mechanical cleaning systems, such as ultrasonic, steam, or boiling. Use only the methods recommended below. Most opal jewelry and pearls in earrings or other pieces without drill holes can be cleaned with warm water, mild soap, and soft brush, just like many other gemstone jewelry pieces. Make sure you use mild soap only (no other cleaning …
https://eragem.com/news/clean-opal-jewelry/
Sep 30, 2020 · Soaking in soapy water may erode the paste between the layers, causing them to separate. On the other hand, it's fine to soak solid, gem-quality opals, which actually contain between 2% and 6% water. If after soaking some grime remains, use a soft brush or jewelry cloth and gently wipe them off. Then rinse under clear, warm water.
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