The value of a diamond depends on its cut, its clarity, its colour and its carat weight.
A local jeweler can give you the answer you want.
take it to a jewlers and have them look at it. Ask for the diamond grading report. You can also look at the diamond. If there are visible imperfections seen with the unaided eye then the diamond is considered slightly included or lower on the diamond grading scale. If you need a loupe to see an imperfection then the diamond is most likely "SI" or better. Imperfections can be tiny black dots are dark clouds.
For a diamond, FL, or flawless, is the highest grade for clarity -- it is perfection for the stone in terms of its clarity.
The highest grade for 'white' diamond colour is D, not A. D is a higher grade than H in diamond colour.
The grade AA 5 is not a common grade for diamonds. If this is the only grade given for the stone you are buying, you might be buying something other than a diamond.
VS refers to the clarity of the gem: it stands for very slight.VS is a little above middle-of-the-road clarity grade that inclusions will not be visble to the naked eye, and will be very slight under a 10-times magnification.
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It depends on the cut and the grade of the Diamond.
D would be the highest grade
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The highest clarity grade is F - Flawless, or IF - Internally Flawless.
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The Diamond III's are selling from $900 to $1360