A fine antique Black Opal and Diamond ring
An Art Deco ring set with an oval black opal. 9x6mm, this stone has a high intensity of rainbow vibrant colours, electric blue, peacock green and fireglow orange, and as the hand moves these colours become more or less intense.
The shoulders test as platinum and each set with three small white diamonds. Total carat weight of 0.10 carats. Weight 2.2grams
The shank tests as 18 carat yellow gold. Period 1920-1930, no hallmarks were required legally for this era. Size K 1/2 , we can resize for you- free of charge.
Unlike ordinary opals, black opals have carbon and iron oxide trace elements present, which cause the unusual darkness of the stone. Because of their dark body tone, the rainbow colours in a black opal stand out much better than lighter opals.
This vibrancy of colour makes black opal the most valuable form of all opals. Often a black opal will have a natural layer of potch (colourless opal) left on the back of the stone, which can give the stone an extra darkness and vibrancy of colour. The darker this potch backing is, the darker the body tone, which usually makes for greater vibrancy of colour and a higher value black opal. Black opals are generally cut into an oval shape, however this depends on the natural shape of the stone. Sometimes black opals are cut into freeform or teardrop shapes in order to maximise the size and carat weight of the stone. Black opals are normally cut with a low cabochon, due to the opal colour bar often being much thinner in black opal than in white or crystal opals. If the colour bar in an opal is thin, it is impossible to create a domed surface.
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Age or Designation
Art Deco (1920-1935)
Precious Stone
Diamond/Opal
Ring Size
K 1/2
Metal Type
Gold
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