Mix Matched Black Opal Triangle earring charmsCheck out these black beauty stunners: a pair of mix matched Black Opal Triangle charms set in Argentium Silver (940). Both the Black Opal Triangles boasts hues of dark blue and green. Originally the same stone that has been cut in to two irregular triangle shapes. Both opals are hand cut, shaped and polished. Nothing tops the quality of Solid, natural Australian opals from none other than Lightning Ridge, NSW home of the world's ONLY rare Black