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Definition
| clarity characteristic that's confined to the surface of a polished gemstone |
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Definition
| internal or external feature of a gemstone that helps determine its quality and establish its identity |
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Definition
| lighting of a diamond from the side against a black, non-reflective background |
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| the distance that's clear and sharp above and below a point you focus on with a magnifier |
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Definition
| a position that orients a gemstone's crown facets and table toward the viewer |
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Definition
| a trade term for any break in a diamond |
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Definition
| a flash of changing color seen in a fracture-filled diamond when you look parallel to the filled inclusion and rock the diamond back and forth under magnification |
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Definition
| treatment that involves injecting a molten glass substance into a diamond's surface-reaching feathers or laser drill-holes |
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Definition
| clarity characteristic totally enclosed in a polished gemstone or extending into it from the surface |
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Definition
| a mineral crystal contained in a diamond |
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Definition
| a long, thin crystal that looks like a tiny rod at 10X |
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Definition
| a very small included crystal that looks like a tiny dot at 10X |
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Definition
| many tightly grouped pinpoints that might be too small to distinguish individually at 10X but together have a hazy appearance |
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Definition
| a series of pinpoints, clouds, or crystals that forms in a diamond's growth plane; associated with crystal distortion and twinning planes |
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Term
| Internal Graining (IntGr) |
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Definition
| lines, angles, or curves that might appear whitish, colored, or reflective or affect transparency at 10X; caused by irregularities in crystal growth |
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Definition
| a small, concentrated area of crystal distortion; can be white or dark, and might appear thread-like or pinpoint-like |
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Definition
| general trade term for a break in a gemstone; often white and feathery in appearance |
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Term
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Definition
| very small feathers that extend from the girdle surface into the stone; can result from the cutting process |
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Definition
| a tiny area of impact accompanied by very small, root-like feathers visible at 10X magnification; typically occurs a ta facet junction |
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Definition
| an included diamond crystal that extends to the surface after fashioning |
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Definition
| a shallow opening caused by damage to the stone's surface; typically occurs at a girdle edge, facet junction, or culet |
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Definition
| an angular opening created when part of a feather breaks away |
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Term
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Definition
| a portion of the rough's original surface, or skin, that dips below the polished diamond's surface, or an opening left when a surface-reaching crystal drops out or is forced out during polishing |
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Term
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Definition
| a tiny, surface-reaching tunnel produced by a laser light beam |
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Term
| Internal Laser Drilling (ILD) |
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Definition
| laser drilling within a diamond that doesn't reach the surface; not plotted |
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Definition
| a small notch on a facet junction with no readily apparent depth at 10X, usually along the girdle edge or at the culet |
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Definition
| a series of minute nicks along the facet junctions of a fashioned diamond; gives the edges a white or fuzzy appearance |
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Definition
| a thin, dull white line across the diamond's surface; shows no apparent depth at 10X |
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Definition
| a small facet that's not required by the cutting style, placed without regard for the diamond's symmetry; most often found near the girdle |
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Definition
| wavy or bumpy area on the surface of a polished diamond |
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Definition
| fine, parallel grooves and ridges left by polishing; can occur on any facet but do not cross facet junctions; transparent or white |
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Definition
| hazy surface areas that result from excessive heat or from uneven polishing caused by structural irregularities; also called polished or burned facets |
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Term
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Definition
| irregular, pitted, or granular girdle surface |
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Definition
| a small opening that looks like a tiny white dot |
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Definition
| a portion of the original surface, or skin, of a rough diamond left on a fashioned stone; usually on or near the girdle |
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Definition
| similar to internal graining, except it appears on the surface; results form irregularities in the crystal structure |
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Term
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Definition
| large, severe, straight break along a plane of atomic weakness; considered an inclusion |
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Definition
| angular openings that start at the surface of the diamond and extend into it, often with striations, perpendicular to their length; considered inclusions |
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Term
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Definition
| green or brown patch of color, usually seen around the girdle on the surface of a cut diamond; typically blemish, but can be an inclusion if it extends into the stone |
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Term
| Laser Manufacturing Remnants (LMR) |
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Definition
| internal fractures (inclusions) or surface grooves (blemishes) created as a result of laser marking or manufacturing |
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