Diamond and Onyx Ribbon Bow Necklace and Earrings
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Van Cleef & Arpels, diamond and onyx necklace and earclip suite, each designed as a ribbon bow set with round brilliant-cut diamonds and interspersed with circular-cut onyx, signed VCA, numbered, French assay marks, 18ct gold, gross weight 54.3gm, lengths necklace 38 cm, earrings 2.5 cm.
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- Assay / Assayed - Assaying is the testing of a metal, most commonly silver and gold to determine its ingredients and quality. In Britain, once an item of silver or gold has been assayed, a mark is stamped on it, certifying its purity. Known as hallmark, it derives its name from the Guild Hall of the Goldsmiths' Company, who recieved its Charter in 1327 giving it the power to assay and mark articles of gold and silver.
- Onyx - Onyx is a form of agate, used from antiquity and popular again in the 1920s and 30s. European onyx is generally green, but can be many other colours, and can contain bands of black and/or white.
This multicoloured stone is widely used for table tops, lamp bases and in jewellery. Some types of onyx are also used for cameos of which the upper white layer is cut away to reveal the colour beneath.
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