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https://www.gemsociety.org/article/clean-pearls-opals/
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 solution) and a soft brush (not a toothbrush).
https://www.leohamel.com/blog/index.php/2017/06/clean-opal-fine-jewelry-home/
Jun 14, 2017 · To clean solid opals, you should: use a mild detergent and warm water clean gently with a soft cloth avoid bleaches and other chemicals.
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.youtube.com/watch?v=7vsenLvNTno
Jun 03, 2014 · Here I made a video showing the process of cleaning a ring using reverse electrolysis. This is one of the rings I found last Saturday (the fire opal gold/dia...Author: Digginrings
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