I2, I3 Heavily Included Diamonds I2 and I3 diamonds may have more obvious inclusions at 10x and may be visible to the naked eye. I1 Included Diamonds I1 diamonds have minor inclusions that may be visible to the naked eye. SI2, SI1 Slightly Included (SI) Diamonds Inclusions are noticeable at 10x magnification with SI diamonds, the best value diamonds. With SI1 diamonds, inclusions are sometimes visible to the keen eye without magnification. SI2 clarity grade diamond inclusions are usually visible from the pavilion, or cone-shaped lower portion, and from the top. VS1, VS2 Very Slightly Included (VS) Diamonds VS diamonds have minor inclusions that cannot be seen without 10x magnification. VS1 is a higher clarity grade than VS2, which may have some visible inclusions. A VS grade diamond is less expensive than a VVS diamond. VVS1, VVS2 Very Very Slightly Included (VVS) Diamond VVS diamonds have miniscule inclusions that are difficult even for trained eyes to see under 10x magnification. VVS2 clarity diamonds have slightly more inclusions than the VVS1 grade. A VVS diamond is an excellent quality diamond and clarity grade. Internally Flawless (IF) Diamonds Inclusions aren’t visible in internally flawless diamonds under 10x magnification. Some small surface blemishes may be visible on IF diamonds. Flawless (FL) Diamonds Inclusions and blemishes aren’t visible on flawless diamonds, even under 10x magnification. Less than 1% of all diamonds are FL clarity. A flawless diamond is incredibly rare because it’s nearly impossible to find a diamond 100% free of inclusions.