Not a long time ago, I came across useful info about diamond grading. Nowadays, there are many fake stones, and you can buy a piece of jewelry set with glass for a high price without knowing that. That's why it's important to grade your diamond to be sure that the stone is natural. After it, I sent my stones to gsi usa, because it's a modern gemological laboratory, which has not only skilled experts but also uses advanced technologies and the newest equipment.