Evaluating a Diamond's Quality

It's all about the four C's when it comes selecting a diamond. 
  1. Cut
    A diamond's cut is directly related to the amount of light that it reflects. Precise craftsmanship is required to fashion a stone so that its proportions, symmetry and polish deliver the utmost radiant reflection of light. Nine of the most common styles:
  2. Clarity
    Diamond Clarity refers to the amount of blemishes and inclusions a diamond has. GIA rates as FL, IF, VVS1, VS1, VS2, SI1, SI2, I1, I2 and I3. FL being perfect and I3 being poor.
  3. Color
    Diamond color describes the color that the diamond reflects when light is applied to it. GIA rates diamonds on a scale of D-to-Z. On one side of the spectrum is "D", which is the ideal colorless diamond. A "Z" rating is assessed to imperfect diamonds that have a slight color to them.
  4. Carat
    Carat refers to the size or rather the weight of a diamond. As the size increases, so does the value. This is because larger diamonds are rarer and more desirable.