Crystal and Silver Powder Bowl with Tortoiseshell Inset
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Crystal, silver & tortoiseshell powder bowl tortoiseshell inset decoration to handle, silver lid, hallmarked Birmingham 1924, to cut crystal bowl, diameter 10.40 cm, height 12 cm.
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- Hallmarks - A mark stamped on articles of precious metals in Britain, since the 14th century, certifying their purity. It derives its name from the Guild Hall of the Goldsmiths' Company, who recieved its Charter in 1327 giving it the power to assay (test the purity) and mark articles of gold and silver.
The hallmark will consist of several marks, including the:
- silver standard mark, indicating the purity of the metal. Sterling silver is .925 pure silver.
- the city mark indicating the city in which it was assayed eg London, Birmingham, York etc.
- the date mark, usually a letter of the alphabet in a particular font and case,
- a duty mark, indicating whether duty had been paid to the crown, and only in use from 1784 to 1890
The piece may include an additional mark, the maker's mark, although not forming part of the hallmark, will be located in the vicinity of the hallmarks.
Sometimes silver plated items will bear faux hallmarks, often confusing those not familiar with silver markings. - Tortoiseshell - Tortoiseshell is a translucent material that comes from the horny carapace of a certain types of turtles, including the hawksbill turtle. It is often therefore mounted on a colour underground - often red - or inlaid with gold or silver thread, as seen in Boulle furniture.
The texture and colour nuances of the material are extremely important. Heated tortoiseshell can easily be formed into various shapes. Like other natural materials, tortoiseshell becomes more beautiful with use. In a time before plastic, tortoiseshell was widely used for small objects such as combs and powder compacts.
In 1973, the trade of tortoiseshell worldwide was banned under CITES (The Convention on International Trade in Endangered Species). Prior to importing or exporting items containing tortoiseshell a CITES permit must be obtained. Tortoiseshell items cannot be traded on Ebay.
"Faux tortoiseshell", another case of man initiating nature, is made from old-style plastics such as celluloid and cellulos and is coloured with red, yellow and brown spots to imitate the genuine article. It is commonly used in glasses frames, musical instruments and costume jewellery.
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