Is Moissanite Graded on the GIA Color Grading Scale?

GIA has developed a color grading scale which is commonly used in diamonds, and the same scale can be applied to Moissanite. According to the GIA scale

  • Grades D, E, F: colorless
  • Grades G, H, I: near coloress
  • Grades J, K: faint color

So what does that mean? Grades D, E, F and even G are completely colorless and can be described as "icy" white. Grade H and I still look white, but its a slightly warmer or steely white. When you get into the J and K range, you will start to see a bit of yellow.

So what is the difference between D and F color? In reality, little to nothing. One needs to have special lighting, expert training and view the diamond or Moissanite loose (not set in jewelry) and upside down to tell the difference. The difference between D and F is a difference on paper only. Even once set in jewelry and in normal lighting, its difficult to tell the difference between a D color and a G or even H color stone.