H-I (in color) - When grading diamonds "color" refers to the absence of color in a diamond. The rating scale begins at D (meaning colorless) and ends at Z (meaning having a lot of color).
The next group is G-H-I-J and is near colorless followed by K-L-M, which have a slight yellow cast. Most of the diamonds sold on the market will be fall into these color groupings.
It is common to find that diamonds with colorless grades (D-E-F) or near colorless grades (G-H-I-J) are lower in price when they exhibit fluorescence and faint yellow grades (K-L-M) are higher in price when exhibiting fluorescence.
You may have to step up into the G-H-I Range (or higher) just to stay away from Yellow. I will say this is not an easy task. Most Diamonds of this Carat Weight DO have Color. If you want a White Diamond you'll have to pay the price.
D-E-F are the "colorless" grades, and G-H-I-J are "near colorless". The difference in each letter grade is very subtle, and color comparison diamonds of known grades are used under controlled lighting conditions.
 See also: Color, Stone, Diamond, Cut, Natural
  
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