The x10 Magnifier Loupe is the most essential tool of any Diamantaire. The loupe is used for all diamond inspecting, grading, buying and selling. The GIA grades diamond clarity based on how the imperfections of a diamond would look through a 10x magnifying loupe. Based on this, a clarity grading is given to each specific diamond ranging from "Internally Flawless" for a diamond that has no imperfections and down to "i3" for a diamond that shows significant imperfections even visible to the naked eye. The Clarity Gradings are: Internally Flawless, VVS1 - VVS2 - VS1 - VS2 - SI1 - SI2 - I1 - I2 - I3.