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There is a tradition in diamond spectroscopy to label a defect-induced spectrum by a numbered acronym (e.g. GR1). This tradition has been followed in general with some notable deviations, such as A, B and C centers. Many acronyms are confusing though: [2] Some symbols are too similar (e.g., 3H and H3).
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.
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 .
Type II diamonds have very few if any nitrogen impurities. Pure (type IIa) diamond can be colored pink, red, or, brown owing to structural anomalies arising through plastic deformation during crystal growth; [20] these diamonds are rare (1.8% of gem diamonds), but constitute a large percentage of Australian diamonds. Type IIb diamonds, which ...
A large carat weight may not necessarily equate to the overall best-looking diamond. “A smaller, well-cut diamond with excellent color and clarity may appear more stunning than a larger, lower ...
In the U.S., lab-grown diamond sales jumped 16% in 2023 from 2022, according to Edahn Golan, an industry analyst. Skip to main content. Subscriptions; Animals. Business ...
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 ...
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.