Fire is maximized by cutting a diamond to the correct proportions. GIA refers to the Gemological Institute of America, an independent, non-profit organization which sets and upholds standards for grading diamonds and other precious stones. Girdle is the narrow rim around the diamond. The girdle plane is parallel to the table and is the largest diameter of any part of the stone. Head is the part of a ring that contains the prongs which hold a diamond in its setting.
Inclusion is a flaw within a diamond, such as a crystal or fractures.
Inclusion is the trace minerals, fractures and other imperfections that contribute to the unique fingerprint of a gemstone. All but the rarest gemstones contain inclusions, which are created during the gemstones formation in the earth. Jewelry is usually made from 18K and 14K gold, which contain other metals for strength. Loupe is a small magnifying glass used to view gemstones. Naturals are part of the original surface of the diamond crystal left unpolished.