In this video it is clearly explained how the average person looking for a piece of diamond jewelry should look for when looking at the diamond. A flawless diamond is clear so any black spots, clouds, or tiny dots are imperfections. If a loupe is needed to see an imperfection, the diamond is better than a SI (slightly included) clarity grading. SI1 or VS1 is usually your best bang for the buck when buying diamonds. These look great to the naked eye.