There are currently 4 names in this directory beginning with the letter G.
Garnet is a semi-precious stone that is most famous for its red colour. Usually it has a hardness level of between 6.5 and 7.5 on the Mohs scale.
The GIA is a leading gem and jewelry research & education center. It's also renowned for having created the 4 Cs.
The girdle is the widest part of a diamond as well as the outermost edge where the crown and pavilion connects.