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Assuming you mean the Roman letter D used to represent a number: D = 500
A D is a passing grade for 9th grade. It is the overall average of all grades that makes the difference between passing and repeating a grade.
'White' diamonds are graded in colour using letters of the alphabet, from D to Z, D being the highest grade. A number in a diamond's description can reference its weight in carats, or the number of visible flaws.
The numbers are perfect cubes, so d will also be a perfect cube.
Suppose the number is n/d. Then n/d >= d => n <= d2 if d < 0 or n >= d2 if d > 0.