4.71ct AFRICAN BLACK OPAL OVAL CABOCHON CUT NATURAL UNTREATED RARE 13x10mmModern Jewelry4.4(205)$3,300Mar 19, 2026
15.01ct Natural Black with Blue Sparkle Nuummite, Oval, OpaqueWeatherham Estate Treasures4(220)$1504 days Left
Natural Black Spinel 2.51 Ct. Oval Cabochon Shape 9.7 x 7.6 Mm Gemstone From ThailandTreasure of Gems & Jewelry4.4(221)$1Mar 15, 2026
23.7ct Oval Cabochon Black with Blue Sparkle Nuummite GemstoneWeatherham Estate Treasures4(220)$1652 days Left
Natural Black Star Sapphire 3.12 Ct. Oval Cabochon Shape 9.6 x 7 Mm Gemstone from ThailandTreasure of Gems & Jewelry4.4(221)$16 days Left