For more specific information about each diamond shape, visit our diamond shapes page by clicking below:

Abrasion: Tiny nicks along facet junction, producing white fuzzy lines instead of sharp crisp facet edges.

Baguette: A step cut in the shape of a small rectangular stone. It may be tapered at one end.

Bearded girdle or Bearded: Tiny, numerous, hairline fractures extending into the stone.

Bezel: A facet on the crown, or upper part of the diamond above the Girdle.

Blemish: Surface imperfection external to the diamond.

Bort: Industrial grade diamonds.

Bow-Tie Effect: An effect caused by a shadowy area visible in some fancy shapes, caused by light leaking out the bottom of the diamond.

Bruise: An inclusion consisting of surface crumbling, often accompanied by tiny, rootlike feathers.

Burned Facet: This facet may appear whitish, or burnt, as a result of the cutter polishing the facet "against the grain". 

Carat Weight: The metric carat, which equals 0.20 grams, is the standard unit of weight for diamonds and most other gems. If other factors are equal, the more the stone weighs, the more valuable it will be.

Knot: An included diamond crystal which reaches the surface of a polished diamond.

Laser Drill Hole: A tiny tube made by a laser. The surface opening may resemble a pit, while the tube usually looks needle-like.

Loupe: magnifying glass usually of 10x.

Melee: Small diamonds under 0.20 carat.

Mohs Scale: The ten point scale of mineral hardness, keyed arbitrarily to the minerals talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond.

Natural: Part of the rough diamond remaining on the diamond, having survived the cutting process. This is usually the sign of a good cutter attempting to maximize the weight retention of the rough diamond.

Needle: A long, thin included crystal which looks like a tiny rod.

Nick: A notch near the girdle or a facet edge.

Off-Make: A poorly proportioned diamond.

Old European Cut: Early round cut similar to the Round Brilliant Cut, but carrying a very small table and heavy crown. Not as popular today because it does not return the same brilliance as the modern brilliant.

Pavilion: The bottom part of the diamond, below the girdle.

Pinpoints: Miniscule spots internal to a diamond. A cluster of pinpoints can form a cloud.

Pit: A tiny opening, often looking like a white dot.

Point: 100th of a carat.

Polish Lines: Tiny parallel lines left by polishing. Fine parallel ridges confined to a single facet, caused by crystal structure irregularities, or tiny parallel polished grooves produced by irregularities in the surface.

Polish Mark: Surface clouding caused by excessive heat (also called burn mark, or burned facet), or uneven polished surface resulting from structural irregularities.

Rough Girdle: A grainy or pitted girdle surface. Often with nicks.

Round Brilliant Cut: The most common cut containing 58 facets. Also the ost brilliant cut, in terms of most efficient use of light to increase brilliance and fire, hence the name.

Saturation: A color's position on a neutral to vivid scale.

Scratch: A linear indentation normally seen as a fine white line, curved or straight.

Spread Stone: A diamond with a large table and a thin crown height.

Surface Graining: Surface indication of structural irregularity. May resemble faint facet junction lines, or cause a grooved or wavy surface, often cross facet junctions.

Tone: A color's position on a colorless-to-black-scale.

Treated Diamond: A diamond with a body color induced by some form of artificial irradiation,  often in conjunction with controlled heating (known as annealing).

Twinning Wisp: A cloudy area produced by crystal structure distortion, usually associated with twinning planes.

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