Opals are pretty.
Full stop
And they are incredibly rare and labor intensive to mine.
So why not just make them at home?
All it takes is seven or so months, a fume hood, some ethyl alcohol (purer is better), tetraethyl othosilicate, ammonium hydroxide, a stirrer, water bath, hot plate, resin, a vacuum chamber, and apparently infinite patience.
I looked into buying them, and even the synthetic ones aren't terribly cheap.
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