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Blemishes

Abrasion: tiny chips along facet junctions, producing white fuzzy lines instead of sharp facet edges.

Extra Facet: a facet placed without regard for symmetry and not required by the cutting style.

Natural: part of the original crystal surface remaining on the polished stone.

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

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

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 scaife surface.

Polish Mark: surface clouding caused by excessive heat, or uneven polished surface resulting from structural irregularities.

Rough Girdle: a grainy or pitted girdle surface, often with nicks.

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

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

Inclusions

Bearding: tiny feathers extending in from a bruted girdle (called hairline feathers on a polished or faceted girdle).

Bruise: surface crumbling, often accompanied by tiny, root-like feathers.

Cavity: a large or deep opening.

Chip: a small or shallow opening usually on the girdle edge.

Cloud: a hazy or milky area made up of a number of very small inclusions.

Feather: a separation or break due to either cleavage of fracture, often white and feathery in appearance.

Grain Center: a small area of concentrated crystal structure distortion, usually associated with pinpoints (rare).

Included Crystal: a mineral crystal contained in a diamond.

Indented Natural: a natural that penetrates the stone.

Internal Graining: internal indications of irregular crystal growth; may appear milky, like faint lines or streaks, or may be coloured or reflective.

Knot: an included diamond crystal which reaches the surface of a fashioned stone.

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

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

Pinpoint: a very small inclusion; under 10x, normally seen as a tiny dot, either singly or in groups or strings.

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