Internally Flawless IF
Free from internal blemishes visible under 10x magnification
(small external details tolerated) |
Very Very Slightly included VVS
Inclusions and/or external blemishes very difficult to locate under 10x magnification |
Very Slightly included VS
Inclusions and external blemishes difficult to locate under 10x magnification |
Slightly included SI
Inclusions and external blemishes easy to locate under 10x magnification |
Included I
Medium or large inclusions and/or external blemishes which are usually visible with the naked eye under favorable lighting conditions. |