why are opals so expensive
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why are opals so expensive
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why are opals so expensive, how expensive are opals, are opals worth money, are opals worth anything, are opals more expensive than diamonds, how valuable are opals, what are opals worth today, why is black opal expensive, how much do opals cost, price of opals today, most expensive type of opal, the most expensive opal in the world, world's most expensive opal, how much do opals sell for, is opal an expensive stone, does opal cost money