Glossary

A-D

Blemish
A clarity characteristic that occurs on a diamond’s exterior surface.

Brilliance
The intensity of sparkle a diamond emits through reflection and refraction of light in the face-up position.

Carat
Measurement number for the weight of a diamond calculated into hundredths of a carat.

Clarity
Degree to which a stone is free from flaws. Diamonds are evaluated based on scale from “flawless” to “imperfect.”

Color
The saturation of color realized in a diamond. Fancy color diamonds are graded by hue and intensity ranging from Fancy Vivid to Faint. The more intense/vivid the color, the more rare it will be and therefore desirable to investors.

Crown
The top part of the diamond, above the girdle.

Culet
A polished facet positioned parallel to the table in order to diminish damage to the point. In the GIA Laboratory, graders determine culet size face-up, looking through the table facet at 10_ magnification.

Cut
Refers to the polish, symmetry and proportions of a diamond as it pertains to optimal light reflection.

Cutlet
Also spelled “culet”. A facet positioned at the tip of the pavilion where the mains come together in order to diminish the chance of damage on loose diamonds.

Diamond
A diamond is a clear transparent precious gemstone completely made of carbon atoms (chemical composition “C”) crystallized in a cubic (isometric) arrangement that has been highly compressed over millions of years.

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E-H

Facets
Diamond facets are the smooth surface areas of a diamond that have been cut, polished and positioned at different angles, which allow light to enter and reflect back from the stone. The depth, width and the uniformity of the facets control the brilliance and the durability of a diamond.

Fancy Color Diamonds
Gemologists measure hue, value, saturation of color and the overall consistency and allocation of color to describe fancy color diamonds. The fancy grade describes the stone’s tone and saturation with romantic terms like “Fancy Light,” “Fancy Intense” and “Fancy Vivid.”

Fancy Shape
Any diamond shape other than a round shape.

Finish
The end result and quality of how well a diamond has been designed, and facetted by a cutter.

Fire
Capability of a diamond to disperse white light up from the pavilion (bottom of a diamond) and exit through the table (top of the diamond) to reflect a spectrum of light to the viewer.

Flaw
Imperfections inside a diamond. Also see “Mark”. Note: Gemologists use the word marks when referring to clarity as they do not like to use such terms as “imperfections” or “flaws” because by the very nature of diamonds being so rare and beautiful, such negative terminology is not accepted by industry specialists.

Flawless
Diamond that shows no inclusions after magnifying it 10 times.

Fluorescence
A diamond’s propensity to produce a soft color glow when placed under ultraviolet light.

Girdle
Perimeter of a diamond dividing the top from the bottom.

Hue
The color’s characteristics.

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I-P

Inclusion
Imperfections, or flaws, found inside a diamond (i.e. tiny spots of white, black, or other colors, cracks).

Internally Flawless
A diamond that may have minor surface blemishes but is internally clear.

Investment Diamonds
Alternative asset that provides a reliable store of value. Rare, fancy color diamonds provide an established return on investment.

Loose Diamonds
Diamonds free of settings.

Mark
Another term for “flaws” in a diamond.

Pavilion

Bottom of the diamond.

Points
Measurement of the weight of diamonds. One point is equivalent to one-hundredth of a carat.

Polish
The appearance of the surface of a diamond. Considered one of the markers of the value of a diamond’s cut. Rated as “Ideal”, “Excellent”, “Very Good”, “Good”, “Fair”, or “Poor”.

Proportion
A combination of a diamond’s brilliance, scintillation and dispersion. Obtaining the appropriate balance is achieved primarily through proper cut proportion, which includes the table size, crown height and angle, pavilion depth and angle, girdle thickness and culet size.

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Q-Z

Refraction
A change of direction, bend of a ray of light.

Return of Light
Also referred to as “Brilliance”. It is the degree to how bright a diamond is, and how much interior distinction it offers. This affects how much light returns to the observer.

Saturation
The strength or weakness of the color.

Scintillation
The way in which light disperses off the surface of stone when moved.

Shape
The shape in which a diamond is cut (i.e. Emerald Cut, Princess Cut, etc.). Also referred to in the industry as “cuts”.

Symmetry
Refers to the alignment of a diamond’s facets, its flat and polished surfaces. The facets should be cut to achieve the best play of light.

Table
Top of the diamond that shows the light.

Tone
The color’s relative lightness and darkness.

Transparency

The degree to which a stone is clear, hazy or cloudy.

Vivid Diamond
A diamond that displays a rich and intense color and hue.

Wealth to Wear ©
Wearing and enjoying a piece of jewelry that houses an investment-grade color diamond.

Weight

Measured in carats.

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