SI2 Diamonds Editorial status: This verification-first guide explains SI2 clarity without treating the grade as a guarantee of appearance. It shows buyers how to assess an individual diamond’s inclusions, cut, shape, certification, durability, and inspection terms before purchasing. What are SI2 diamonds? SI2 diamonds are graded “Slightly Included 2” for clarity, meaning a professional grader can see noticeable inclusions under 10× magnification. The grade does not by itself say whether inclusions are visible without magnification. Eye appeal depends on an