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| Adamas |
The Greek word for 'extreme hardness', and the root of the word diamond. |
| AGS |
American Gem Society |
| Angle |
Related to crown angles and pavilion angles above and below the girdle. |
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| Blemishes |
Imperfections or flaws in a diamond. |
| Blue White |
A white diamond with blue fluorescence. In the olden days this diamond was the most desirable. |
| Brilliance |
A stone with maximum dispersion and fire, a lot of life. |
| Brilliant Cut |
A round diamond. |
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| Cape |
Slightly yellow diamonds. |
| Carat |
The unit of weight for diamonds. 1.00 carat equals 100 points. 0.50 carat equals 50 points. |
| Carbon |
Inclusions in diamonds, usually black or other colors. |
| Clarity |
Amount of inclusions in a diamond, ranging from flawless to imperfect under 10 power magnifiction. |
| Cloud |
A blurry area in the diamond negatively affecting the diamonds clarity grading. |
| Color |
The basic color of diamonds from white to yellow, measured on a scale from D through Z. |
| Crown |
Top part of the diamond above the girdle. |
| Crystal |
A flow in the grain of a diamond. |
| Culet |
The point at the bottom tip of the diamond. |
| Cut |
Proportions of a diamond. |
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| De Beers |
The world's largest suppliers of rough diamonds. |
| Depth |
The relationship between the outside diameter of the diamond and the distance from the table to the culet. |
| Diamond Light |
Artificial white light, free of ultraviolet and equivalent to northern daylight. |
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| EGL |
European Gemological Laboratory. |
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| Facet |
Any surface area on a diamond. |
| Fancy Color |
Diamonds with intense colors, all but white. |
| Fancy Shape |
All other cuts but rounds, such as marquise, pear, emerald... |
| Feather |
A type of flaw. |
| Fluorescence |
A measurement of a diamond's emission of light when under ultraviolet light or x-rays, from none to very strong. Some diamonds emit blue or yellow fluorescence. |
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| GIA |
Gemological Institute of America. . |
| Girdle |
The circumference or edge of a diamond. |
| Grain |
Internal grain lines in or outside a diamond (part of the crystal orientation). |
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| Ideal Cut |
A stone that is cut for maximum brilliance. |
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| Laser Drill |
A process of drilling into a diamond to eliminate carbon spots. |
| Loupe |
10 power magnification used to view and grade diamonds. |
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| Natural |
Uncut area on a diamond most frequently found on the girdle of the finished diamond. |
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| Pavilion |
The bottom part of the diamond below the girdle. |
| Pique |
An imperfection in a diamond. |
| Polish |
Smoothing and finishing of a diamond. |
| Proportion |
How well a diamond is cut. |
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| Table |
The largest facet at the top of a diamond. |
| Tiffany |
A simple, elegant engagement ring with 4-6 prongs on the top. |
