Spectacular Crystal Opal Looks Like a Handheld Aquarium This particular crystal, whose image is shared by opal retail and auctioning site Inna Gem , is a very rare Oregon opal shown in its dry state. Opals are known to change color and opacity, depending on whether they are wet or dry. When soaked in water, the base color of an opal can become extremely clear, though this is bound to change in a few weeks' time as it dries out.
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