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Diamond Glossary1

Diamond Glossary


The height of a diamond, measured from the culet to the table.


A crystal made up of 99.95% pure carbon atoms arranged in an isometric, or cubic, crystal arrangement. It is this unique arrangement of the carbon atoms that makes diamond look and behave differently from other pure carbon minerals such as graphite (the soft black material used to make pencils).

Diamond Cutting

The method by which a rough diamond that has been mined from the earth is shaped into a finished, faceted stone. As a first step, cleaving or sawing is often used to separate the rough into smaller, more workable pieces that will each eventually become an individual polished gem.

Diamond Gauge

An instrument that is used to measure a diamonds length, width and depth in millimeters

Double Diamond

"Double Diamond" is an American skiing term for an extreme, expert-only ski slope, designated by a sign with 2 black diamonds. Also known as a double black diamond. Double Diamond is also the name of an English beer.


Diamond is one of the hardest, toughest, and most durable of substances.

Eight Cut

Also called "single cut". Diamonds, usually small, with only 18 facets instead of the full 58 on a brilliant cut.

Eppler Cut

Eppler devised the specifications for this "Practical Fine Cut" in 1939.

Eye Clean

No visible inclusions with the naked eye, therefore at least SI in clarity.


The name of a famous diamond.

Emerald Cut

An emerald cut is more "glassy" in appearance, since its facets usually span the length or width of the stone. Emerald cuts are different from step cuts in that their corners are rounded.

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.


The flat polished surfaces on a diamond. s have 58 triangular facets and therefore "sparkle" more than emerald cuts, which have far fewer facets and therefore have a more "glassy, elegant" look.

Fancy Diamond

A diamond with an attractive natural body color other than light yellow or light brown.


A separation or break due to either cleavage or fracture, often white and feathery in appearance.


An imperfection of a stone.


When light is refracted within the diamond, the result is that multi-colored light beams out of the table, and it somewhat looks like fire. For maximum fire, seek out a well-proportioned stone.


A bluish glow within the diamond when exposed to ultraviolet light. Some people like fluorescence and some dont. In any case, strong fluorescence should be avoided.

Full Cut

With 58 facets, i.e. usually a brilliant cut, and usually round.


Gemological Association and Gem Testing Laboratory of Great Britain. Now Gem-A.


Manufacture and market "Gemesis Cultured Diamonds, based in Sarasota, Florida, USA.


A person with expertise in gemology, a gemstone expert. There are formal qualifications, such as F.G.A. (Fellow of the Gemological Association) in the UK.


Any organic or inorganic mineral or material, excluding metal, which is used to decorative effect in jewellery. Some argue that only natural, rare or valuable items should be included.


Gemological Institute of America. Reliable diamond certification. Diamond research.


The narrow band around the width of the diamond, where the crown and pavilion meet.

Grain Center

A small area of concentrated crystal structure distortion, usually associated with pinpoints.

Girdle Facet

Any of the facets adjacent to the girdle on a brilliant cut or other diamond, split into upper (crown) girdle facets, and lower (pavilion) girdle facets.

Girdle Thickness

The measurement describing the percentage of the diamond’s average girdle diameter.

Grading Report

Sometimes called a “certificate”, although labs do not “certify” diamonds. The grading report, issued by an independent laboratory, should accurately describe the proportions, weight, color, clarity, symmetry, polish and possible fluorescence seen in the diamond being evaluated. Some labs such as GIA and AGS are felt by many experts to be more consistent and stringent in their grading than some other labs.

Golden Jubilee

The largest faceted diamond in the world, weighing 545.67 carats.


The process of appraising a diamond, and allocating grades to it.

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