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Diamond reports from GIA (as well as other, for-profit sources) are now demanded by most consumers purchasing diamonds over a certain size, typically for over 0.5 carat (100 mg), and almost always for over 1.0 carat (200 mg), and are considered an important tool in guaranteeing that a diamond is accurately represented to a potential buyer.
The majority of mined diamonds fall between white and pale yellow or brown; what is known as the normal color range. Diamonds of more intense color (usually yellow, but in some cases red, green or blue) are termed fancy color diamonds. Black diamonds are also fancy color diamonds. All other factors being equal, the most valuable diamonds are ...
Consumer Reports (CR), formerly Consumers Union (CU), is an American nonprofit consumer organization dedicated to independent product testing, investigative journalism, consumer-oriented research, public education, and consumer advocacy.
In 2012, together with his family, he established a Gemological laboratory in Bangkok called Lotus Gemology. In 2017, Lotus Gemology published Hughes' book Ruby & Sapphire: A Gemologist's Guide, [7] covering the corundum gem species. [8] [9] In 2019, Tongji University created an exhibit centering on Lotus Gemology's photography. [10]
Each grid has the clarity options on the horizontal line and the color options on the vertical line. In order to calculate the price of a diamond according to the Rapaport Price List, you need to know the size, color and clarity of the diamond. The price listed based on this information is in hundreds of dollars per carat. [3]
As consumer preferences evolve, particularly among younger generations who prioritize sustainability, synthetic diamonds are increasingly seen as a responsible and modern alternative to mined diamonds. Retailers are responding to this trend by expanding their offerings of lab-grown diamond jewellery, further solidifying their place in the market.
Yellow diamonds of high color saturation or a different color, such as pink or blue, are called fancy colored diamonds and fall under a different grading scale. [36] In 2008, the Wittelsbach Diamond, a 35.56-carat (7.112 g) blue diamond once belonging to the King of Spain, fetched over US$24 million at a Christie's auction. [60]
The Fancy Color Research Foundation was founded in 2005 when the organization began to collect data for fancy color diamond wholesale market prices. Data was collected for nearly ten years before the first quarterly update of the Fancy Color Diamond Index (FCDI) in January 2015. [ 3 ]
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