Antique, Edwardian opal & diamond cluster ring, 18ct yellow gold & platinum

In Focus: An antique Edwardian opal and diamond cluster ring. Set to centre a 0.75 carat cabochon-cut dark opal displaying a spectrum of colour, set in a fine platinum setting and encircled by a cluster of single-cut diamonds. The twelve diamonds amount to a combined weight of 0.48 carats and are also secured in platinum grain settings with an open back-holing. The gallery is scalloped and gently pierced leading to tapering shoulders. Tested 18ct yellow gold and platinum, circa 1905.   History:  Place of Origin: United Kingdom Date Period: Circa 1905   Ring Mount: Metal Composition: 18ct gold and platinum Hallmarks: Hallmarks rubbed Ring Size: UK N / US 6.75 (Complimentary resizing available) Ring Weight: 3.52 grams   Stones: Opal: Weight approximation, 0.75 , Natural Diamonds: Weight Approximately, 0.48ct total, single cut diamonds, Natural Dimensions: Face: 13.2mm (L) x 10mm (W) Setting Height: 5.5mm   General Condition: Great vintage condition with minimal wear. All stones are secure and the ring has been professionally cleaned and polished. minor rubbing to the opal noted Stone weights and measurements are estimated in the mount.