Antique Onyx and Pearl Diamond Jabot Pin - Elegant Beauty
onyx, pearl, diamond and gold jabot pin; terminating at each end with an oval onyx plaque centring a cultured pearl, accented with rose-cut diamonds set in pierced platinum, mounted in 15ct gold with an 18ct gold pin, length 4.41 in., total gross weight approximately 16 grams.
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- 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. - Rose Cut - A flat based cut for a preious stone, leaving the surface covered with triangular facets, usually 24 in total.
It was introduced in the 15th century and popular during the 16th and 17th centuries.
The rose cut was the most popular form of diamond cut until the discovery of the brilliant cut at the end of the 17th century, after which its use declined.
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