GIA (Gemoloigical Institute of America) has a grading system for Diamonds. The grading system has eleven Clarity Grades.

• Flawless
• Internally Flawless
• Two categories of Very Very Slightly incluced (VVS1 and VVS2)
• Two categories of Very Slightly included (VS1 an VS2)
• Two categories of Slightly included (SI1 and SI2)
• Three categories of Included (I1, I2 and I3)

When buying a diamond it is very import to see what grade of diamond you are buying as this greatly affects the price of the Diamond.