What factors contribute to the value of antique opal triplet jewelry?

... opal when it turns out to be a triplet or doublet. One really has to be careful. I just wanted to point this out. 13 hrs. 1. Steve Weber. Barry Porter real ... Girlfriend Present Natural Black Triplet Opal Pendant Solid 925 Silver 7.88cts ... Australian Opal Natural Black Triplet Opal Earring With FREE JEWELLERY BOX!!! Aug 14, 2000 ... Triplets are glued together 3 pieces, quartz or plastic top, opal center either natural mosaic or gilson, and base usually of basalt or onyx. Australian Triplet Opal Sterling Silver Pendant Material: Sterling Silver Size: 10.5mm x 20mmOpal: 9mm x 7mmCome with Sterling Silver Chain (Length: 45cm) ... Jun 5, 2021 ... I love opals, particularly Australian boulder opals. I haven't had much luck with them though. I think I bought them too cheaply and they ... Opal triplets consist of a piece of light opal, adhered to a dark backing and a clear capping. They are created to give the appearance of rare Black Opals, at a ... This mesmerizing brooch contains a black opal triplet, with excellent play-of-color, that is bezel set and bordered with a twisted rope detail. amber triplet near the protein's amino terminus (16). The identity of the ... identity with opal (anticodon UCA; C35) and amber (anti- codon CUA; U35) ... May 6, 2022 ... Spring 1964, Treated Black Opal, by Gübelin, p. 157, 3pp. Fall 1964, Opal triplet; black onyx backed, quartz topped, p. 221, 2pp. Winter ... Lot 162: Michael Zobel. Opal triplet, diamond, sterling silver, and gold pendant brooch. estimate: $800–1200. Set with cabochon opal triplets and round ...