Australian Triplet Opal Ring set in solid gold. Triplet Opal is classified as Genuine Australian Opal Type 3. It is an assembly of Gem Crystal Opal, a hydrated amorphous form of silica SiO2·nH2O consisting of spheres of silicon dioxide molecules arranged in regular, closely packed planes. Backed by Australian Black Opal potch and capped with a cabochon layer of silica quartz. The three layers have the same coefficient of thermal expansion and are guaranteed for life against delamination. Guaranteed free of dyes and artificial colour.
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