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Definition
| a term used to describe the effects of treatments on the visual appeal of a gemstone |
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| a tabletop magnifier with two eyepieces |
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| forming the basic face-up outline of a diamond to prepare it for faceting |
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| a collective term for diamond cleavages and fractures |
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| treatment that involves injecting a molten glass substance into a diamond's surface-reaching feathers or laser drill-holes |
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| treatment that involves using a concentrated beam of laser light to reach a diamond's dark inclusions and to disguise or eliminate them |
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| a small, portable magnifying lens used for examining gemstones |
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| term that describes a diamond that might have surface blemishes, but shows no inclusions under 10X magnification |
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| an individual or company that cuts and polishes diamonds and colored stones |
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| a general term for included stones |
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| a color-keyed diagram of a gemstone's significant clarity characteristics |
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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; typically occurs at a facet junction
[image] |
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an angular opening created when part of a feather breaks away
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a shallow opening that occurs at a girdle edge, facet junction or culet; caused by damage to the stone's surface
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many tightly grouped pinpoints that might be too small to distinguish individually but together have a hazy appearance
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general trade term for a break in a gemstone, often white and feathery in appearance
[image] |
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Definition
a small, concentrated area of crystal distortion; can be white or dark and might have a thread-like or pinpoint-like appearance
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Definition
a mineral crystal contained in a diamond
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a portion of the rough's original surface that dips below a polished diamond's surface, or an opening left when a surface-reaching crystal drops out
[image] |
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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
[image] |
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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
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Definition
a transparent included diamond crystal that extends to the surface after fashioning
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Definition
a tiny, surface-reaching tunnel produced by a laser light beam
[image] |
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a thin, elongated crystal that looks like a tiny rod at 10X
[image] |
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a very small crystal that looks like a tiny dot at 10X
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a series of pinpoints, clouds or crystals that forms in a diamonds growth plane; associated with crystal distortion and twinning planes
[image] |
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a series of minute nicks along the facet junctions of a fashioned diamond; gives the edges a white or fuzzy appearance
[image] |
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Definition
a facet that's not required by the cutting style, placed without regard for the diamond's symmetry; most often found near the girdle
[image] |
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Definition
wavy or bumpy area on the surface of a polished diamond
[image] |
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a portion of the original surface of a rough diamond left on a fashioned stone; usually on or near the girdle
[image] |
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a small notch on a facet junction with no readily apparent depth at 10X, usually along the girdle edge or at the culet
[image] |
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Definition
a small opening that looks like a tiny white dot
[image] |
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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 area that results from excessive heat or from uneven polishing caused by structural irregularities; also called polish mark or burned facet
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Definition
irregular or granular girdle surface
[image] |
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Definition
a thin, dull white line across the diamond's surface; shows no apparent depth at 10X
[image] |
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Definition
similar to internal graining, except it appears on the surface; results from irregularities in the crystal structure
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| a scale for grading clarity including eleven diamond clarity grades; the scale narrows at the top because there are very few diamonds in the higher clarity grades |
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Term
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Definition
diamonds which show no inclusions or blemishes or any kind when examined under 10X by a skilled grader
a flawless diamond can have these clarity characteristics:
- extra facets not visible in the face-up view
- naturals confined entirely to the girdle, as long as they don't thicken the girdle or distort its outline
- internal graining that not reflective, white, or colored, and that doesn't significantly affect transparency
- inscriptions that don't appear to penetrate the surface when viewed at 10X
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Term
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Definition
diamonds which show no inclusions but do have some minor blemishes when examined using 10X magnification by a skilled grader
blemishes are typically surface grain lines, naturals and extra facets |
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Term
| Very Very Slightly Included (VVS1 and VVS2) |
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Definition
diamonds which contain minute inclusions that are difficult even for experienced graders to see under 10X magnficiation
VVS1- extremely difficult to see
VVS2 - very difficult to see
inclusions are typically pinpoints, tiny feathers, internal grading, a bearded girdle or tiny cavities |
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Term
| Very Slightly Included (VS1 and VS2) |
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Definition
diamonds which contain small or minor inclusions observed with effort under 10X magnification
inclusions are typically small crystals, clouds, or feathers |
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Term
| Slightly Included (SI1 and SI2) |
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Definition
diamonds which contain inclusions that are noticeable to an experienced grader under 10X magnification
inclusions are typically clouds, included crystals, knots, cavities and feathers |
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Term
| Included (I1, I2, and I3) |
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Definition
diamonds which contain inclusions that are obvious under 10X magnification
Inclusions are typically large feathers or large included crystal and they may affect the transparency and brilliance of the stone |
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