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Antique Art Deco, Platinum, Black Opal and Diamond Cluster Cocktail Ring


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Product SKU: ARB-88
Black opal and diamond ring, circa 1920. Collet-set with an oval black opal, displaying a superb play of colour against a grey background. Opal iridescence is caused by light interacting with an extremely fine network of silicon dioxide spheres within the opal, and the specific colour seen depends on the size of these spheres. The most common colours seen in opal are blue and green, and the rarest is red. This opal is exceptional in displaying a true rainbow of colours, including red, in broad flashes against a darker body colour, meaning an underlying structure of significant complexity, and resulting in a stone of extraordinary vibrancy. Opals became extremely popular during the mid 19th century, with the best deposits located in Mexico, and in particular, Australia’s ‘Lightning Ridge’. The pierced shoulders are millegrain-set with cushion-shaped diamonds, their delicate details complementing the simple cabochon form of the opal.


Place Of Origin United Kingdom
Stone Type
Opal: 2.75 carat (calculated)
Diamonds: Approx. 0.50 carats total
Stone Dimensions
Opal: 14.5mm x 9.0mm x 3.7mm
Height of setting: 5mm
Dimensions of setting at front: 20mm x 14.5mm
Metal Type Platinum
Marks 'PLAT' (partially worn) / Maker’s mark 'H&S'
Date Of Manufacture 1920s
Period Of Manufacture Art Deco
Condition Very good
Signs Of Wear Very minor wear to mount commensurate with age
Some minor evidence of resizing to shank
Band Size
UK P 1/2 / US 8 (complimentary re-size available)
4.80 grams (gross)