Clarity is based over a diamond's inclusions. Inclusions are often natural crystals trapped within the gem or other characteristics from the diamond’s formation that make a diamond distinctive. Grades range between Flawless to Provided. Learn More Carat Gemologists use unique instruments to scrutinize diamonds for clarity and detect any imperfections. https://ricardoprkbs.blogpostie.com/56099220/the-smart-trick-of-ngic-certificate-diamond-that-nobody-is-discussing