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Black Opal - colors arise in opal when there is uniformity in the size of silica spheres. Patches of different size spheres (while still uniform to neighbors) results in the multi-color pattern seen here.

Black Matrix Opal

1.68 ct CABOCHON CAB. WELLO ETHIOPIAN SOLID OPAL R1049

opal

Opals are so pretty!

Opals-On-Black: Lightning Ridge Black Opal Bead BK013

PRECIOUS OPAL with IMPORTANT HISTORIC PROVENANCE. Virgin Valley, Humboldt County, Nevada, USA. Photo Heritage Auctions.