Gem Quality
A diamond that is of gem quality, i.e., one that possesses desirable properties. Only about 10% of all diamonds found are of gem quality.
G.I.A.
The Gemmological Institute of America.
Girdle
The girdle is the outer edge of the diamond between the crown and the pavilion. It can be faceted, polished or smooth. The girdle thickness varies from stone to stone and can range from extremely thin to extremely thick. There are four grades in the middle of this range that are considered to be optimal.
Girdling
Another name for bruting or rounding where the rough stone is rounded and the girdle is formed.
Gletz (also spelled glets, glatts)
Another name, of Dutch origin, for a feather.
Grain lines
These can appear within a diamond as faint parallel lines and can mostly only be observed using magnification.
A diamond that is of gem quality, i.e., one that possesses desirable properties. Only about 10% of all diamonds found are of gem quality.
G.I.A.
The Gemmological Institute of America.
Girdle
The girdle is the outer edge of the diamond between the crown and the pavilion. It can be faceted, polished or smooth. The girdle thickness varies from stone to stone and can range from extremely thin to extremely thick. There are four grades in the middle of this range that are considered to be optimal.
Girdling
Another name for bruting or rounding where the rough stone is rounded and the girdle is formed.
Gletz (also spelled glets, glatts)
Another name, of Dutch origin, for a feather.
Grain lines
These can appear within a diamond as faint parallel lines and can mostly only be observed using magnification.
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