Schlumberger's "Bird on a Rock" Brooch by Tiffany & Co
Jean Schlumberger for Tiffany & Co. citrine, ruby and diamond 'Bird on a Rock' brooch, centring a bird modelled as a cockatoo surmounted with a gold plume, the body pave-set with brilliant-cut diamonds, the eye accented by a circular-cut ruby, perched above a claw-set cushion-shaped citrine weighing between 60.00 and 65.00 carats, the diamonds stated to weigh 2.99 carats, mounted in platinum and 18ct gold, length 2.17 in., numbered, signed Tiffany & Co. Schlumberger Std., accompanied by a Tiffany & Co. Box., Literature, Claire Phillips (Ed.), Bejewelled by Tiffany 1837-1987, London, 2006, pp. 275,276 (illustrated, another example). Other Notes: Jean Schlumberger visualized the 'Bird-on-a-Rock' brooch design in 1961 to display a large topaz. For the designer's 1995 retrospective at the Musee des Arts Decoratifs in Paris, the Tiffany diamond, a rare 128.54 carat fancy yellow diamond, was remounted into this iconic design. Subsequently the brooch was put on permanent display in the brand's flagship store on fifth Avenue, New York. Today, amongst collectors, this seminal design is instantly identified with the Tiffany brand.
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- Carat - A carat (abbreviated "ct") is a unit of measurement used to describe the weight of a diamond or other gemstone, and separately is a unit of measurement used to describe the weight of precious metals such as gold,.
For gemstones, one carat is equal to 0.2 grams or 200 milligrams. The weight of a diamond is one of the Four Cs (along with cut, colour, and clarity) that are used to determine a diamond's value.
It is important to note that a diamond's weight does not necessarily correspond to its size. A diamond's cut, which affects how well it reflects light, can make a diamond of a lower weight appear larger than a diamond of a higher weight. Additionally, the carat is not the only factor to determine the value of a diamond, other factors such as clarity, colour and cut are important too.
In the gold industry, the purity of gold is measured in carats (abbreviated "ct"), with 24 karats being pure gold and lower carat numbers indicating a lower purity level. So, for example, 18 carat gold is 18/24 or 75% pure gold, and 12 carat gold is 12/24 or 50% pure gold. - 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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