VS1 and VS2 are the clarity grades for small inclusions that a grader finds with some effort at 10x magnification.
In more detail
VS inclusions are minor, and you rarely see them with the unaided eye. The step from VVS2 to VS1 depends on the type and size of the characteristics, not only their number.
On a grading report
Written VS1 or VS2 in the clarity grade line.
Related terms
- Very, Very Slightly Included (VVS1, VVS2): VVS1 and VVS2 are the clarity grades for very small inclusions. Even a skilled grader has difficulty finding them at 10x.
- Slightly Included (SI1, SI2): SI1 and SI2 are the clarity grades for inclusions that are noticeable at 10x magnification.
- Clarity grade: The clarity grade says how free a diamond is of inclusions (inside) and blemishes (on the surface) at 10x magnification. GIA's scale has 11 grades in six categories, from Flawless (FL) to Included (I3).
- 10x magnification: 10x magnification is the standard view for diamond clarity grading: ten times life size, with a loupe or a microscope.