D - Colorless - Highest color grade, completely lacking any color , Very valuable and rare.
E -Colorless - Minimal traces of color seen in the face down position. Still in the colorless category. Desirable and valuable.
F - Minimal traces of color seen in the face down position. Still in the colorless category. Desirable and valuable.
G - Near Colorless - Slight traces of color, can look colorless face-up. Looks great , better value.
H - Near Colorless - Minor tint seen in the face up position. Very popular, still a high color look with more reasonable prices.
I - Near Colorless - Color is becoming slightly noticeable. Also popular because stone looks very attractive and represents a good value.
J - Near Colorless - Traces of color are more observable. Beautiful, affordable choice.
Excellent Cut to exact proportions for maximum light reflection. Has the highest combination of brightness, pattern and fire. Most expensive cut grade. Top 2.5% of diamond quality cut grade.
Very Good Beautifully proportioned stone with superior light reflection. Cut to high standards but represents a lower cost that ideal cut. Top 17% of diamond quality cut grade.
Good Properly cut, attractive stone. Favorable light reflection and brilliance. A good Value. Top 23% quality cut grade.
Fair Satisfactory cut with some brilliance. Adequate light reflection. A good value. Top 35% diamond quality cut grade.
VS1 Very Slightly Included 1-Minor inclusions difficult to see with magnification. Looks clean to the naked eye.
VS2 Still characterized as having minor inclusions, easier to see with magnification. Generally inclusions cannot been seen with the naked eye.
SI1 Noticeable inclusions seen with magnification. With difficulty, some inclusions may be seen with naked eye.
SI2 Inclusions are easier to see with magnification and may be visible to the unaided eye.