6.87Ct Natural Ethiopian Black Opal - 18.1x15.0x5.0 mm , 618CKsmith Heritage Auctioneers4.4(49)$501176 Lots Away
3.91Ct Natural Ethiopian Black Opal - 14.1x9.8x5.7 mm , 603CKsmith Heritage Auctioneers4.4(49)$501028 Lots Away
Natural Multi Color Flashing Boulder Opal Gemstones 19.77 Ct. Free Form Cabochon Shape 32 x 17 Mm.Treasure of Gems & Jewelry4.5(267)$1(1 bid)Sep 12, 2026
Natural Multi Color Sparkling Matrix Boulder Opal Gemstones 3.35 Ct. Free Form Cabochon Shape 10.2 xTreasure of Gems & Jewelry4.5(267)$1(1 bid)Sep 18, 2026
