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This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). [1] The list is not intended to be complete—e.g., the Cullinan (formerly Premier) mine alone has produced 135 diamonds larger than 200 carats since mining commenced.
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]
A weekly diamond price list, the Rapaport Diamond Report is published by Martin Rapaport, CEO of Rapaport Group of New York, for different diamond cuts, clarity and weights. [33] It is currently considered the de facto retail price baseline. Jewelers often trade diamonds at negotiated discounts off the Rapaport price (e.g., "R −3%").
The Diamond Trading Company (DTC) is the rough diamond sales and distribution arm of the De Beers Group. The DTC sorts, values and sells about 35% of the world’s rough diamonds by value. [ 1 ] The DTC has a combination of wholly owned and joint venture operations in South Africa (DBSSSA), Botswana (DTCB and DBGSS), and Namibia ( NDTC ).
Since the 1950s, techniques can produce gem-quality diamonds of essentially any desired chemistry in sizes up to about 1cm. [6] Although some manufacturers do label their synthetic diamonds with serial numbers, there is no guarantee that a given diamond is not man made, although sometimes an unnatural chemical composition or pattern of flaws may suggest a diamond is synthetic.
When discovered in 1905 the 3106.75 carat (621.35 g) Cullinan was the largest rough gem-quality diamond ever found. It was cut into 105 diamonds including the Cullinan I or the Great Star of Africa, 530.2 carats (106.04 g), and the Cullinan II or the Second Star of Africa, 317.4 carats (63.48 g), both of which are now part of the British Crown ...
The 253-carat Oppenheimer Diamond—an uncut diamond does not show its prized optical properties. In colored diamonds, cutting can influence the color grade of the diamond, thereby raising its value. Certain cut shapes are used to intensify the color of the diamond. The radiant cut is an example of this type of cut.
The Golden Jubilee Diamond, a 545.67 carat (109.13 g) brown diamond, is the largest cut and faceted diamond in the world. It outweighs the Cullinan I by 15.37 carats (3.07 g). The Golden Jubilee Diamond was discovered in 1985 at the Premier Mine , which is also the origin of the Cullinan diamond (1905) and other notables such as the Taylor ...