18ct gold opal brooch, stamped 18ct, with central bezel set…

18ct gold opal brooch, stamped 18ct, with central bezel set…
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18ct gold opal brooch, stamped 18ct, with central bezel set doublet opal with rope twist surround, on a 18ct yellow gold tapered bar setting, total weight 3.68gm, length 5 cm

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  • Doublet and Triplet - A doublet and a triplet are both composite imitation stones, consisting of two or three joined layers. A triplet is made with the crown and base of genuine material, but with a centre layer, usually of glass, the object being to make the stone appear larger than it really is. A doublet consists of only two layers.

    Opal doublets are quite common and consist of a thin layer of opal cemented to an opal matrix or black glass.
  • Bezel - On a clock or watch, the bezel is the metal frame into which the watch or clock glass is fitted. In clocks, the bezel may include a hinge and a flange, in effect a door to the face of the clock. In jewellery the bezel is a band of metal with a projecting lip that holds the gemstone in its setting.