This answer assumes that your notation indicates a D colour, and an Internally Flawless clarity.
In a random search for the size, colour and IF designation, these prices appear current as of December 2009. Round is the cut, size, colour, clarity, US dollar price:
The differences are accounted for based on the GIA-certified gemologist's opinion as to the cut: very good, ideal or premium, where premium is the most expensive cut.
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Lena buys d dog bowls that cost $3.25.how much did they cost altogether
A 'D' grade for a diamond refers to its colour. This grade is the highest jewelry grade of diamond, and it means that the stone lacks significant nitrogen, which gives a diamond a yellow colour.
A Diamond
If the angles are labelled A, B, C and D with A and C as the "pointier" ones, then C=A, B=D=180-A where A is any angle between 0 and 90 degrees. Clearly, A cannot be 0 degrees and if A is 90 degrees, the diamond (rhombus) becomes a square.
If J is a description of the colour of a white diamond, that grade is given to the near colourless diamonds. You can learn more about this grade from the chart, below, which shows you the full colour range of 'colourless diamonds' from D to Z.