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What color of opal is the most expensive

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asked Dec 10, 2016 by CTfisherman (120 points)

1 Answer

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The most brilliantly coloured stones are valued highly. There are some black opals which are highly prized. Fire opals, too. They are a very porous stone.
answered Dec 12, 2016 by Weasel (42,940 points)
 


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