VS clarity diamonds differ from Slightly Included (SI) and Included (I). The inclusions in the former are more difficult to spot, small, and less detectable even when examined by a professional jeweler.
The type and size of inclusions determine the difference between VS1 and VS2.
Inclusions are smaller and less noticeable in VS1 than in VS2 clarity diamonds. Under VS2, inclusions will be more prominent and visible.
For example, inclusions near an edge or cavity may be classified as VS1. However, others may be classified as VS2 if located near the table, making them more noticeable.
If you watch diamonds in James Allen's 40X magnified HD videos, you will see the difference between VS1 and VS2 diamonds.
The grading scale for diamond clarity is as follows:
- Flawless (F): No blemishes or inclusions detectable under 10x magnification.
- Internally Flawless (IF): Same as Flawless but with detectable blemishes on the surface.
- Very Very Slightly Included (VVS): Has inclusions, but a professional grader will find them hard to spot under 10x magnification. It also includes VVS1 and VVS2, with the former having fewer inclusions.
- Very Slightly Included (VS): This diamond grade contains minor inclusions ranging from somewhat challenging to easy to see with a jeweler's loupe. VS1 and VS2 come under this classification.
- Slightly Included (SI): These diamonds have imperfections that may sometimes be visible to the naked eye. Under 10x magnification, the flaws can be described as easy or very easy to see.
- Included (I): This grade has inclusions visible to a grader under 10x magnification. The inclusions will almost always be visible to the naked eye and create imperfections that may impact the longevity of the stone.