Asscher Cut
A fully made emerald cut with very large corners.

A style of step cutting for small, rectangular shape diamonds.

Barion Cut
A mixed cut comprised of 62 facets. It is a combination of two cuts, the crown being a full emerald cut and the pavilion a modified brilliant cut.

The portion of a faceted diamond below the girdle. Same as pavilion.

The central area of a marquise, oval or pear shape diamond, when viewed from above.

Bevel Cut
A variation of the step cut diamond, produces a larger a larger table, having one or two bevel facets from the girdle. The bottom may or may not be faceted. If it is the same at the top of the stone, it would be a double bevel cut.

A rim of gold or platinum that surrounds and secures a diamond.

Bezel Facet
The eight large, four sided facets on the crown of a round brilliant cut diamond.

The intensity of the external reflections of white light to the eye from a diamond, in the face up position.

A round brilliant cut diamond.

Brilliant Cut Round
The most popular style of cutting for diamonds. The standard round brilliant having a total of 58 facets: 1 table facet, 8 bezel facets, 8 star facets, 16 upper girdle facets, 8 pavilion facets, 16 lower girdle facets and the culet. The proportions, faceting, angling and fashion technique was developed by Tolkowsky for maximum brilliance. Not all round diamonds are cut in this fashion.

A pear or drop shape stone with a circular cross section. The entire diamond is covered with triangular facets.

A unit of weight used for diamonds and gem stones. 1.00 Ct. = .200 grams or 200 milligrams

A nonmetallic chemical element. An inclusion in a diamond that appears black to the unaided eye.

Carbon Spot
A term used in the jewelry industry, referring to any black inclusions or imperfections in a diamond.
Inclusions that appear black under regular lighting, often are reflections seen from cleavage or transparent inclusions.

Clarity Grade
A scale used world wide positioning diamonds from flawless to imperfect. The scale is as follows: Flawless-IF, Very, Very Slightly Imperfect-VVS,
Very Slightly Imperfect-VS, Slightly Imperfect-SI, Imperfect-I.

Color Grade
A scale used world wide positioning diamond body color on a scale of colorless to yellow.

Cushion Cut Diamond (antique)
An older form of a brilliant cut diamond. Having a rectangular girdle outlined with rounded corners with facets that are similar to the faceting arrangement of the brilliant cut.

Diamond Bourse
A wholesale diamond exchange dealing mainly in polished diamonds.

Diamond Club
A wholesale diamond exchange, marketing channel where diamond cutters and wholesalers sell and distribute.

Diamond Dealers Club
A non-profit trading association composed of diamond importers, wholesalers and cutters.

Diamond Gauge
A mechanical devise, usually calibrated in millimeters and fractions of millimeters, used to determine the precise measurements of a diamond.

Diamond Setter
A person having training, experience and skill to mount a fashioned diamond into a jewelry item, using proper tools.

Dutch Rose Cut
Also, know as the Holland rose cut diamond. Having more points than other rose cut diamonds. There are 24 triangular facets arranged in groups of 6 over a flat base. The height of a Dutch Rose Cut is usually half the diameter of the diamond.

Emerald Cut
It is of rectangular shape, it has rows of elongated facets on the crown and pavilion, parallel to the girdle, and with corner facets. The number of facets may vary, however the usual number is 3 on the crown and 3 on the pavilion.

A process in which a small steel tool is used to carve away bits of metal to create a design

A polished surface placed on a diamond.

The process of placing a facet on a diamond.

Fancy Cut
Any shape diamond other than the round brilliant diamond. Also may be referred to as fancy shape diamonds.

Fully faceted diamond

Diamond usually fluoresce blue, making the diamond look cloudy and greasy, detected by ultraviolet lamp.

Four C’s
A phrase referring to cut, color, clarity and carat weight.

A cut and polished diamond that possess the necessary beauty and durability for use in jewelry.
A term used to express an especially fine diamond specimen; A Gem Diamond.

Gemological Institute of America
A non profit Educational Institute, campus in California and New York.

A specialist in Gems. One who has successfully completed studies in the identification and appraising of diamonds and gemstones.

The science and study of gemstones.

Gemological Institute of America

The outer edge, or periphery, of a full fashioned diamond.

Girdle Facets
The 32 triangular facets placed upon the girdle.

Girdle Thickness
The thickness of the outer edge, or periphery, of a full fashioned diamond.

Graduate Gemologist
One who holds the Graduate in Gemology Diploma, awarded by the Gemological Institute of America, after successful completion of Gemological Courses.

A decorative process of applying very tiny gold or platinum beads to a gold or platinum ring.

Gypsy Setting
Ring mounting in which the diamond is deeply set into the metal so that the table facet is almost level with the metal surface.

Heart Shape Brilliant Cut Diamond
A heart shape variation of the round brilliant cut diamond.

Jewelers Vigilance Committee
A non profit association to advance ethical practices in the jewelry trade.

A unit of weight the term refers to the proportions of pure gold in an alloy. Pure Gold is 24 Karat.

Leverage Gauge
A millimeter dial micrometer, or measuring both uncounted and mounted diamonds.

A small magnifying glass mounted, used to evaluate clarity of diamonds.

Lozenge Cut
A four sided diamond, usually step cut, resembling the shape of a four pointed diamond shape.

Marquise Cut
A style of Diamond in which the girdle resembles that of a boat, facets are of the brilliant cut type.

In the jewelry trade the word is used to describe smaller round brilliant diamonds.

Metric system of measuring length, based upon the meter. Used to measure diamonds.

Millimeter Micrometer
A precision caliper gauge that measures the overall dimension unmounted fashioned diamonds.

A trade term for the portion of the piece of jewelry in which a diamond will be set in to.

Boat shape also; marquise cut diamond.

Octagon Cut
An octagonal (8 sided), form of cutting, usual step cut facets.

Old European Cut
The term used for the earliest form of circular girdled full brilliant cut diamond. Characteristic; very small table, heavy crown rather deep.

Old Mine Cut
The term used to an earlier form of the brilliant cut diamond, having a square or cushion shape girdle. Characteristics: high crown, smaller table than the modern cut.

Oval Cut
The outline of the girdle is elliptical; rounded oblong.

Pave Setting
The style of setting smaller round diamonds close together, showing the least amount of metal possible. Metal beads are set over the diamonds to hold them in place.

Pear Shape Cut
A variation of the brilliant having a pear shaped girdle outline, having 58 facets.

The use of a saw and blade to create a design, done by hand.

The smoothness of the surface of the diamond, the smoothness gives optical perfection. A well polished diamond does not show wheel marks or other surface blemishes.

A person whom places and polishes any of the facets on a diamond.

The major factors that determine the cutting quality.

The return or rebounding of light rays reacting on the surface of a diamond.

Rose Cut Diamond
The common older cut of a rose diamond; it has the usual flat, unfaceted base, with a pointed dome shape crown, having various amounts of haphazardly placed facets.

A flashing or twinkling of light from the facets. The amount of facets on the stone will reflect light to the eye as the set diamond is moved about.
The quality of the polishing on the facets, the brighter and stronger the reflections flash.

Same as mounting, the portion of the jewelry that actually holds the diamond.

Single Cut
A simple form of cutting a diamond, and much less costly than a full cut brilliant diamond. The single cut having only 16 or 17 facets, apposed to 68 facets as a full cut round brilliant.

Slightly Imperfect - SI
A grade of relative imperfections in a diamond, signifying a more flawed condition than the, very slightly imperfect – VS.

Square Cut Emerald
A form of a step cut with a square girdle outline, modified by corner facets.

The exactness of placing and shaping the facets to proportion of a fashioned diamond.

The large facet on top of the diamond that caps the crown of a fashioned diamond.

Tapered Baguette
A tapered modification of the straight baguette.

Triangle Cut
A three sided diamond, usually step cut.

Trilliant Cut
A modern variation of the triangle shape, having 44 facets.

Very Slight Imperfect – VS
A clarity grade between very, very slight – VVS and slightly imperfect –SI. VS grade is very lightly flawed difficult to find with 10X loupe, not visible to the naked eye.

Very, Very Slightly Imperfect
This grade is between internally flawless - IF and very slight – VS. VVS grade is very, very extremely lightly flawed and most difficult to detect with a 10X loupe.

The abbreviation for very slightly imperfect.

The abbreviation for very, very slightly imperfect.

Well Made
A stone of good proportions and finish