Slightly Included 3 (SI3) diamonds are diamonds that have slight inclusions (imperfections) that are visible under 10x magnification. These inclusions may include things like small crystals, feathers, or clouds, and they may affect the clarity and overall appearance of the diamond. SI3 diamonds are generally considered to be less valuable than diamonds with higher clarity grades, such as SI2 or SI1, but they may still be suitable for use in jewelry and can be a good choice for people who want a diamond with some inclusions but at a lower price point. It is important to note that the clarity of a diamond is just one of the factors that determines its value and beauty, and many people find that diamonds with slight inclusions are still attractive and appealing. It is also worth considering that diamonds with higher clarity grades may have fewer inclusions, but they may also be more brittle and susceptible to damage.