Gorgeous, rare natural Australian blue and green fire mined semi black opal cabochons in rare 3.5mmm rounds. The stones measure 3.5mm in diameter and are about 1.5mm thick with a low dome. There are 6 stunning stones to the lot, weighing a total of 0.55 carats. They are opaque with dark blue hue and green fire. Gorgeous hue and natural, mined crystal opals! Suitable for setting in fine jewelry.
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