Hydrophane opals can absorb water by definition, and release it. Sometimes, when set in jewelry that has open backing or is constantly touching skin, if worn for a few years, these stones can get a translucent/yellow look as a result of absorbing skin oils (or sebum).
Anything that can go in, should be able to go out. It’s quite an easy fix. Break down the oil with acetone so it flows more quickly, and soak, then allow the acetone to evaporate.
I hope this video helps even just one person get the stone back that they once fell in love with, and maybe grow to love it all over again
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