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Got these today... Very dark transparent green, white and honey opals from Manggal hill, Tirtomoyo, Wonogiri, Indonesia.
It is worth to cut into cabochon?

Gosh, it's hard to say judging from a photo, but they look big enough to give it a try and see what you get, being prepared to accept that they may not be worth all the work. Did you dig them up yourself or buy them? Let us know what you do with them.

Purchase from the miner. Cheap but mostly milky white and transparent dark green. I found small hyalite welded together with green opal

Finished common opals