18ct gold, gem-set and diamond 'Parentesi cocktail' necklace, Bulgari, circa 2009, designed as a graduated line of spectacle and claw-set rose-cut gemstones including blue topaz, amethyst and citrine, flanked by tapered batons pave-set with brilliant-cut diamonds between similarly set annular links, inner circumference approximately 15.75 in., signed Bulgari, maker's marks, accompanied by a Bulgari certificate and box.
- Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.
- 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.
- Claw Set Jewellery - The description "claw set" in jewellery refers to a setting where the gemstone is held in place by metal prongs that resemble claws. These prongs are bent over the edges of the gemstone to secure it in the setting. This type of setting is commonly used for diamonds and other precious stones.
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