How can the setting of a gem sometimes obscure whether it's a triplet?

SKU: 001-270-09683. Three (3) oval triplet opal gemstone (5.23 carats total weight) 10x8mm. $55.00. Jun 16, 2021 ... A doublet can be identified by looking at its side or edges. It will have a very clean, straight, and visible seam where the opal was glued to ... Aug 27, 2021 ... I thought a triplet means a naturally occurring opal, but this looks like it's man-made out of opal and glass. 2” H x 1.4” W (Height includes earwires) OPAL Triplet: The Opal is a hydrated amorphous form of silica and because of its amorphous character, it is classed ... Opal Doublets & Triplets are slices of lower valued Opals modified to imitate how a Black Opal looks. Black Opal is called such because of its dark body tone ... 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 ... Strong triplet–triplet annihilation upconversion (TTA-UC) of sub-bandgap ... opal photonic crystal consisting of metal nanoparticles and platinum(ii)- ... Jun 6, 2024 ... Both types contain genuine opal and offer unique advantages that can enhance the beauty of your jewelry collection. Opal doublets provide a ... Feb 26, 2025 ... irenebyrneandco on February 26, 2025: "We've just manufactured this bespoke 'Sweetheart' Opal triplet necklet in sterling silver. Doublets and Triplets can be a fantastic alternative to solid Australian Opal, given they are far less expensive than solid Black Opals.