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6.45 Black Crystal Opal Rough Please note this opal rough is for experienced cutters only, and cutting rough opal is always a gamble. This opal can be purchased as an investment, opal mines in Australia are becoming barren and as the years pass the value of the rough can potentially go up year over year. Greens/Blues/Yellow array of color Black Crystal Opal rough can go for $1000 a carat + once cut