Wholesale opal doublets and triplets. This category  comprises  small lots of wholesale priced doublets and triplets as well as some individual gems. These are perfect for silversmiths, goldsmiths, on-sellers or anyone wanting doublets and triplets at a bargain price. Particularly for those wanting to get in to the industry and to have a go. Great gifts for an incredibly low price if you are travelling. A doublet is a composite of two pieces where a slice of natural opal is cemented to a base material with blackened glue and enhances the colour. A triplet is a composite of three pieces where a thin slice of natural opal is cemented between a dark base material and a transparent top layer (usually of quartz or glass).