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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/
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.
https://connoisseurs.com/jewelry_care_tips/how-to-clean-an-opal/
The best way to clean an opal is with Connoisseurs Dazzle Drops Advanced Jewelry Cleaner …the non-toxic cleaner that makes fresh solution every time; or Delicate Jewelry Cleaner, a longtime Connoisseurs fan-favorite in the classic red jar.
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.
https://www.jewelrynotes.com/clean-and-care-for-opals/
Cleaning Surrounding Metals and Gemstones Some opal jewelry contains diamond chips or other gems that will also need cleaning. The metal the opal is set in will need cleaning as well. A toothbrush may be used with the same cleaning solution to make the metals and gemstones sparkle, but avoid using the toothbrush on the opal itself.
https://www.opalauctions.com/learn/how-tos/how-to-care-for-opal-jewelry
Jan 31, 2018 · Jewelry cloths are recommended to clean your Opal jewelry. Using a silver cloth for silver jewelry and a gold cloth for gold Opal jewelry will help to maintain the brightness of your Opal. If the cloth becomes dirty with black residue try to avoid using that side. Store your cloth in a zip lock bag so no dust particles can contaminate the cloth.
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