Australian 9ct Gold Opal Bow Brooch by Joseph Lawrence
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A vintage Australian 9ct gold triplet opal brooch, bow brooch, 27 x 13 mm suspending an 18 x 13 mm oval triplet opal, length 34 mm, wt. 2.75g, marks for Joseph Lawrence.
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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.
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