In Diamonds it is one of the highest Clarity stones according to GIA, the scale is as follows:
From Highest(most expensive) to lowest(least expensive)
IF, WS1, WS2, VS1, VS2, S1, S2, I1, I2, I3
the most expensive stone carat for carat would probably be a naturally purple diamong of IF clarity and D color.
"...cause i'm the one coppin all the VS Stones"-Lloyd Bank$