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Diamond Glossary
The knowledge and more information you have the better diamond purchase you will make. Here are a number of diamond terms that are used by jewelers to describe diamonds and which appear on diamond grading reports.
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E:
Emerald Cut:
A square or rectangular-shaped diamond with cut corners. On the crown, there are three concentric rows of facets arranged around the table and, on the pavilion, there are three concentric rows arranged around the culet. This type of cut is also known as a Step Cut because its broad, flat planes resemble stair steps.
Eye-Clean:
An term used in the jewelry industry to describe a diamond with no blemishes or inclusions that are visible to the naked eye (i.e. a human eye which is not aided by magnifying devices such as a jeweler's loupe or a microscope).
Excellent Cut:
A GIA and HRD-CGL grade for excellent cut and polish of brilliants.
Extra Facet:
A facet placed without regard for symmetry and not required by the cutting style. Any facet added to the stone which is in excess of the facets normally required to complete the polishing. Usually found along the girdle to remove any imperfections.
European Cut:
Obsolete. A diamond brilliant whose proportions were worked out mathematically for light falling perpendicularly on the crown. It was never adopted as a common form of cutting. The angle of the pavilion facets to the girdle is 38° 40’; of the bezel facets, 41° 6’. The table is 56% of the girdle diameter; crown depth, 19%; and pavilion depth, 40%. It is not to be confused with the old European cut.
EGL:
European Gemological Laboratory - A franchise diamond grading facility. The diamond certificate records all the relevant information pertaining to the diamond, including carat weight, colour grade, clarity grade, measurements and physical properties as well as plotting diagrams. E.G.L. has always been in the forefront of innovation particularly when it comes to its certificates. The motivation has been to match the presentation of the certificate with the value of the diamond.
Enamel:
A vitreous glaze. In jewelry, it is usually fused glass that is heated to a base--most commonly to the surface of metal, glass or pottery.
European Gemological Laboratory (EGLUSA):
Grading Lab in New York
External Characteristics:
Imperfections located on the surface of a stone.
Engraving:
The incising or cutting of a linear design into the surface of a gem or metal.
Etching:
The chemical removal of metal, usually by an acid or chloride
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