Vintage 9ct Gold Opal Spray Brooch
A vintage 9ct gold opal brooch, spray design rub set with a 0.91 in. x 0.55 in. oval triplet opal, size 0.91 in. x 0.55 in. x 1.77 in. x 1.18 in., wt. 6.08g.
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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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