How To Identify High Grade Cashmere

There is no official grading system for cashmere.  A search on the internet will provide different definitions for these non-official grades such as Grade A and Superior, but these are just marketing terms.  Raw cashmere wool is sorted by color (white, brown, grey) with white being the most expensive as it can be dyed any color and requires less processing.  It is then sorted by fiber diameter, with the thinner and longer fibers being more expensive as they are softer and pill less.