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The weight of a diamond is one of these variables that determines a diamond’s worth and is what the general public is most familiar with. The unit of measurement, called the carat, equals 200 ...
[i] The carat is divisible into 100 points of 2 mg. Other subdivisions, and slightly different mass values, have been used in the past in different locations. In terms of diamonds, a paragon is a flawless stone of at least 100 carats (20 g). [3] The ANSI X.12 EDI standard abbreviation for the carat is CD. [4]
The GIA Laboratory provides a variety of gem grading and identification reports for diamonds over 0.15 carats. [10] Diamond grading reports for unmounted natural and laboratory grown diamonds determine their key characteristics: color, clarity, cut and carat weight. GIA issues several types of reports for natural diamonds, the most popular for ...
Stones near the top of a size band (or rarer fancy coloured varieties) tend to be uprated slightly. Some of the price jumps are related to marketing and consumer expectations. For example, a buyer expecting a 1 carat (200 mg) diamond solitaire engagement ring may be unwilling to accept a 0.99 carats (198 mg) diamond. [citation needed]
Around 50% of the 133 million carats of natural diamonds mined per year end up in industrial use. [145] [149] Mining companies' expenses average 40 to 60 US dollars per carat for natural colorless diamonds, while synthetic manufacturers' expenses average $2,500 per carat for synthetic, gem-quality colorless diamonds.
Since the per carat price of diamond shifts around key milestones (such as 1.00 carat (200 mg)), many one-carat diamonds are the result of compromising cut for carat. Some jewelry experts advise consumers to buy a 0.99-carat (198 mg) diamond for its better price or buy a 1.10-carat (220 mg) diamond for its better cut, avoiding a 1.00-carat (200 ...
On 10 December 2008, the 35.56-carat (7.112 g) Wittelsbach Diamond was sold to London-based jeweller Laurence Graff for £16.4 million sterling, or US$23.4 million, at the time the highest price ever paid at auction for a diamond. (The previous record had been held by a pear-shaped 100-carat (20 g) stone named the Star of the Season.) The ...
The 1,111-carat Lesedi La Rona diamond, also from Botswana’s Karowe Mine, was bought by a British jeweler for $53 million in 2017. Another diamond from Karowe, The Constellation, was sold for ...