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The highest grade of diamond falls into four categories:

  • Clarity -- Flawless or Internally Flawless.
  • Colour -- "D" colourless, or Intense Vivid Fancy for a coloured stone.
  • Cut -- since the cut is determined by the previous categories, if the stone is of the highest rating for those, then the cut must be near perfect.
  • Carat weight -- This is determined by all three preceding categories and the goal is to make it as high/ heavy as possible.
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