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Diamonds become increasingly rare when considering higher clarity gradings. Only about 20% of all diamonds mined have a clarity rating high enough for the diamond to be considered appropriate for use as a gemstone; the other 80% are relegated to industrial use. Of that top 20%, a significant portion contains one or more visible inclusions.
The Aurora Green Diamond is a 5.03-carat (1.006 g) vivid green diamond with VS2 clarity. In May 2016, the Aurora Green became the largest vivid green diamond to ever sell at auction. [ 1 ] The record was previous held by a 2.54 carat Fancy Vivid Green VS1 diamond that was sold by Sotheby’s on November 17, 2009, for $1.22 million per carat ...
Diamond clarity is the quality of diamonds that relates to the existence and visual appearance of internal characteristics of a diamond called inclusions, and surface defects, called blemishes. Clarity is one of the four Cs of diamond grading, the others being carat , color , and cut .
The clarity, or purity, of a diamond refers to internal inclusions of the diamond, and is one of the 4-Cs in determining a diamond's value.Common inclusions that appear inside diamonds are black carbon spots and small cracks, commonly referred to as fractures or "feathers", due to their feathery whitish appearance when viewed from above or through the side.
Diamonds of smaller sizes are traded in parcels of similar stones, called 'melee,' after the French word for mix. Generally diamonds of exactly similar size, cut, shape, color and clarity are used in a single piece of diamond jewelry. If not, the stones would not match and the piece would not sell.
Color grading of diamonds was performed as a step of sorting rough diamonds for sale by the London Diamond Syndicate. As the diamond trade developed, early diamond grades were introduced. Without any co-operative development, these early grading systems lacked standard nomenclature and consistency. Some early grading scales were; I, II, III; A, AA, AAA; A, B, C. Numerous terms
Type IIa diamonds can have their structural deformations "repaired" via a high-pressure, high-temperature process, removing much or all of the diamond's color. [5] Type IIa diamonds constitute a great percentage of Australian production. Many famous large diamonds, like the Cullinan, Koh-i-Noor, Lesedi La Rona, and The Lulo Rose are Type IIa.
The single descriptive words are as follows: Excellent, Very Good, Good, Fair, and Poor. The distance from the viewer's eye to the diamond is important. The 2005 AGS cut standards are based on a distance of 25 centimeters (about 10 inches). The 2004 HCA cut standards are based on a distance of 40 centimeters (about 16 inches).
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