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A certified colour change Sri-Lankan sapphire & diamond ring in art deco style , the natural untreated sapphire of emerald cut and weighing 4.45 carats, six graduated rectangular diamonds to shoulders, on white metal shank testing as 18ct gold, with yellow gold claws, accompanied by Gem & Pearl Lab Report No. 13098 stating that the sapphire is natural and shows no evidence of heat treatment, appearing blue in daylight and purple in incandescent light. SEE ILLUSTRATION
A unheated Burmese ruby and diamond cluster ring, c1910, the oval shaped mixed cut ruby weighing 3.30ct, claw set within a twelve old cut brilliant cut diamond surround, mounted in 18ct yellow gold, ring size L ** Offered for sale with a GCS Laboratory certificate stating that the ruby is of Burmese (Myanmar) origin, with no indications of heating - non heated rubies are scarce
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