(Product Description at amazon.com)The diamonds grade show I-1, I-2 or I-3 means that is imperfect, with a grade of I-3 is the worst. Other diamonds grades are VVS1 and VVS2. It means that the diamond is very slightly imperfect. VS1 and VS2, meaning the diamond is very slightly imperfect. SI-1 and SI-2, which means that the diamond is slightly imperfect.
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