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u+25c8 white diamond containing black small diamond A lozenge ( / ˈ l ɒ z ɪ n dʒ / [ 1 ] LOZ -inj ; symbol: ), often referred to as a diamond , is a form of rhombus . The definition of lozenge is not strictly fixed, and the word is sometimes used simply as a synonym (from Old French losenge ) for rhombus .
Conversations about the diamond — also spelled Koh-i-noor — which is part of the British crown jewels, have been trending on social media amid coverage of the queen’s death, with users ...
[44] made their name selling genuine Blue-White diamonds, but others in the industry saw the opportunity to use the term to sell lower quality diamonds. By 1938, the term "Blue White" and the underlying concept that blue (i.e. fluorescence) added value to white (colorless) diamonds had become abused by too many unscrupulous dealers and the U.S ...
Diamonds can be sold already set in jewelry, or sold unset ("loose"). According to the Rio Tinto, in 2002 the diamonds produced and released to the market were valued at US$9 billion as rough diamonds, US$14 billion after being cut and polished, US$28 billion in wholesale diamond jewelry, and US$57 billion in retail sales. [108]
A modern hand-carved portrait cameo of white on blue-layered agate, set in 18 kt white gold. Many modern cameos are carved into layered agates. The layers are dyed to create strong color contrasts. The most usual colors used for two-layer stones are white on black, white on blue, and white on red-brown. Three-layer stones are sometimes made.
The stone was cut by a team of 35 using computer-controlled lasers into 26 D-flawless diamonds totaling 223.35 carats (44.670 g), the highest yield from a single diamond. [ 17 ] [ 18 ] The Wittelsbach-Graff Diamond is a 31.06-carat (6.212 g) fancy deep-blue diamond with internally flawless clarity purchased by Laurence Graff in 2008 for £16.4 ...
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In 1959, the importing of diamonds was allowed. In 1967 a U.S. advertising agency created a marketing campaign on behalf of the De Beers diamonds. The campaign equated rings with other symbols of Western culture. The campaign resulted in a sharp increase in demand: From 5% in 1967, to 27% in 1972, to 50% in 1978, to 60% in 1980. [8]