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Samarian Spinel, the world's largest spinel; Menshikov Ruby, the world's second largest spinel set on top of the Great Imperial Crown of Russia; Timur Ruby, believed to be a ruby until 1851, hence its name; Black Prince's Ruby, the famous spinel mounted on the Imperial State Crown of the United Kingdom
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Polyhedral representation of spinel MgAl 2 O 4. Spinel (/ s p ɪ ˈ n ɛ l, ˈ s p ɪ n əl / [7]) is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl 2 O 4 in the cubic crystal system. Its name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed crystals. [5]
The company instituted a planned reduction of costume jewelry, leading to its discontinuation from the Speidel product line in the early 1950s. [25] After the end of World War II , Speidel began to advertise nationally, first in magazines and then in radio with a program called “Stop the Music.”
Howlite is commonly used to make decorative objects such as small carvings or jewelry components. Because of its porous texture, howlite can be easily dyed to imitate other minerals, especially turquoise because of the superficial similarity of the veining patterns. Howlite is also sold in its natural state, sometimes under the trade names of ...
In 2016, the American Gem Trade Association and Jewelers of America added spinel as an additional birthstone for August. [6] Britain's National Association of Goldsmiths created its own standardized list of birthstones in 1937. [7] In 2021, Japanese industry associations added ten new types of birthstones. [8]
Sarah Coventry was an American luxury jewelry brand named after the granddaughter of Lyman K. Stuart, the founder of the company. Established in 1949, the sales force was at first all male. Thousands of women and some men were recruited to sell jewelry at Sarah Coventry home jewelry parties. [1]
The earliest known technique of attaching stones to jewelry was bezel setting. A bezel is a strip of metal bent into the shape and size of the stone and then soldered to the piece of jewelry. The stone is then inserted into the bezel, and the metal edge of the bezel pressed over the edge of the stone, holding it in place.
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