ebda5082_larity_Chart___The_Diamond_Pro__Description
[Clarity Grade] SI1 [Description] 
Slightly Included (1st Degree) – SI1 Clarity inclusions are easily found with a standard jeweler’s loupe at 10x magnification. With most shapes (to the exclusion of step cuts like Asscher and Emerald Cuts), SI1 clarity inclusions are almost always clean to the naked eye.As with the VS2 sample above, the diamond chosen for the sample picture of an SI1 clarity inclusion is an extreme example chosen to show the maximum size and worst possible color of an SI1. One must remember that a clarity grade can be based on many different inclusion points within a diamond. It is less common (especially for SI1 and lower) that the clarity grade is based on one concentrated inclusion. Usually, there are a number of smaller spots and clouds of tiny spots that make up the clarity grade. In these cases, since each individual inclusion is very small, the diamond looks clean to the naked eye.
Diamond Clarity Chart @ The Diamond Pro
Description