1. Color
    The rarest and most expensive are the diamonds that have no color. Diamonds that are light yellow/brown are less expensive and more easily accessible.
  2. Clarity
    Having or not having internal/external imperfections in the diamond (some can only be seen with a microscope). Diamonds that are "flawless" or have little imperfections are higher quality, and therefore more expensive.
  3. Cut
  4. Carats
    Weight of the diamond.