No internal or external inclusions of any kind are visible under 10 x magnification.
No internal inclusions are visible under 10x magnification but there may be some tiny external irregularities in the finish.
Tiny inclusions visible under 10x magnification, which even a professional will have difficulty seeing. We can seperate this category to VVS1 and VVS2 but there is only a slightly difference between them.
Very small inclusions are visible with 10 x magnification to a professional. Most customers will struggle to see them. The category concludes VS1 and VS1 diamond and the difference depends at the placing of inclusions on the rock.
Small inclusions are more easily visible with 10x magnification, but still should not normally be visible to the naked eye.
I1, I2, I3, I4 categorized diamonds have Inclusions that are eye visible.