The ratings for diamonds are determined by 5 different things. The diamond cut, clarity, color, weight and finally the diamond certificate which lists all the unique individual characteristics.
The value of a diamond is primarily determined by the "Four Cs": carat weight, cut quality, color grade, and clarity grade. Carat weight measures the size of the diamond, while cut quality assesses how well the diamond has been shaped and faceted. Color grade evaluates the presence of color, with less color being more valuable, and clarity grade considers the presence of internal or external flaws. Additionally, market demand and brand reputation can also influence a diamond's overall value.
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The price would be determined by the carat weight, the clarity and the colour of the diamond you want to buy in this cut. (An inch is about 2.5CM or .0254MM: a round, 20-carat gemstone measures only .0176 -- and you would purchase such a diamond at an auction, because of the rare size.) Insofar as a gem-quality stone is concerned, you may not be able to find a raw stone large enough to accommodate this cut, since about 60% of the raw stone is lost in cutting. As well, finding an industrial-quality diamond -- a raw stone -- of this size may be difficult.
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The value of a diamond depends on its cut, its clarity, its colour and its carat weight.
Diamond Cut Diamond - 1914 is rated/received certificates of: UK:U
Diamond Cut Diamond - 1916 is rated/received certificates of: UK:U
The value of a diamond cannot be determined based on color alone.
The Diamond - 2011 is rated/received certificates of: USA:PG
The volume of a diamond cannot be determined solely by its weight. The volume would depend on the specific cut, dimensions, and density of the diamond.
Anne Diamond The Diamond Plan - 2000 V is rated/received certificates of: UK:E
The Diamond Man - 1924 is rated/received certificates of: UK:A
The Diamond Star - 1913 is rated/received certificates of: UK:U
Diamond Demon - 1947 is rated/received certificates of: USA:Approved
Diamond Run - 1996 is rated/received certificates of: USA:R
Rough Diamond - 2006 is rated/received certificates of: Australia:PG