Rarity can be based on a couple of things — mainly, color and carat weight. Diamonds come in almost all colors: red, pink, yellow, champagne, white, green, blue, brown and black. The availability to obtain a specific color is what determines rarity as well as the uncut and cut size of the diamond.
The rarest diamond in the world based on color is The Ocean Dream Diamond weighing in at only 5.51 carats, but the color is one of a kind: blue-green.
The rarest diamond in the world based on size is The Cullinan Diamond originally weighing in at 3106.75 carats. That gem was then cut in nine large chunks, 96 small ones and 9.5 carats of unpolished pieces and put into the various British Crown jewels. The Cullinan is white in color.
- The Blue Heart
- The Centenary Diamond
- The Cullinan Diamond
- The Golden Eye Diamond
- The Koh-i-noor
- Spirit of de Grisogono
- The Earth Star
- The Golden Jubilee
- The Ocean Dream Diamond
- The Hope Diamond
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