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D+ one percent away from C- (70%)
The Roman numeral D is equivalent to 500
Grade equivalent score is interpreted by comparing the percentage to the actual letter grade given. In most instances a 90 percent or greater is equivalent to an A letter grade.
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.