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| Abrasion |
| Tiny nicks along facet junctions, producing white fuzzy lines instead of sharp crisp facet edges. |
| Bearded Girdle |
| Tiny, numerous, hairlike fractures extending into the stone. |
| Bearding |
| Tiny, numerous, hairlike fractures extending into the stone. |
| Blemish |
| Surface imperfection external to the Diamond. |
| Bruise |
| Inclusions 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". |
| Cavity |
| An inclusion consisting of a large or deep opening in the stone. |
| Chip |
| A tiny piece missing, caused by normal wear and tear, or by cutting. |
| Cloud |
| A group of tiny white inclusions which result in a milky or cloudy appearance. |
| Feather |
| A separation or break due to either cleavage or fracture, often white and feathery in appearance. |
| Flaw |
| An imperfection in a stone. |
| Fracture |
| A crack on the Diamond's surface. |
| Grain Center |
| A small area of concentrated crystal structure distortion, usually associated with pinpoints. |
| Included Crystal |
| A mineral crystal contained in a diamond. |
| Inclusion |
| Imperfection internal to the Diamond. |
| Internal Graining |
| Internal indications of irregular crystal growth. May appear milky, like faint lines or streaks, or may be colored or reflective. |
| 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. |
| Needle |
| A long, thin included crystal which looks like a tiny rod. |
| Nick |
| A notch near the girdle or a facet edge. |
| 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. |
| 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 Graining |
| Surface indication of structural irregularity. May resemble faint facet junction lines, or cause a grooved or wavy surface, often cross facet junctions. |
| Twinning Wisp |
| A cloudy area produced by crystal structure distortion, usually associated with twinning planes. |
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