Australian Opal Pendant, Doublet, 925 Sterling Silver, g5Opal Doublet Pendant, 925 Sterling Silver Doublet Opals are great value as you have a fairly thick layer of Opal generally 1 2 mm thick which gives the colors a nicer depth and play of light. This particular example has orange flames, blue rivers and purple clouds. The gemstone has been bezel set with an open back. The opal slice has been bonded to another slice of Ironstone, an iron rich form of Jasper, to add strength and stability. Opals can be a