Plaque Design Diamond, Onyx, and Coral Ring in Platinum

Diamond, onyx and coral ring; of plaque design, centring a…
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Diamond, onyx and coral ring; of plaque design, centring a millegrain bezel-set round brilliant-cut diamond weighing approximately 0.90 carats, flanked by a pair of round brilliant-cut diamonds together weighing approximately 0.50 carats, within an onyx, coral and diamond surround, mounted in platinum, size N, total gross weight approximately 7 grams.

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  • Millegrain - A type of jewellery setting where the stone is held is held in position by small adjacent beads of metal. This method of securing the stone was popular in the 19th century.
  • 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.
  • Coral - Coral used in jewellery. Coral is a material that is commonly used in jewellery making. It is made up of the skeletons of tiny marine animals called coral polyps. There are many species of coral, but only one group, Corallium, is suitable for carving, and thus can be used in jewellery manufacture. These have a deep red or pink orange skeleton and are known as "noble coral" or "precious coral".

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