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Glossary

Abrasion

A small scratch on a diamond’s surface.

Appraisal Value

A diamond appraisal is a document that details the physical characteristics of a diamond, makes an evaluation of its overall quality, and assigns a dollar value to it in that specific context. The appraisal value is mainly for insurance purposes and can sometimes be up to three times more than the actual retail value. Note that the appraisal value does not reflect the true value of the diamond.

Asscher Cut

A fancy shaped diamond with a squared shape and prominently cut corners. Asscher cut diamonds have straight, step-like facets similar to those exhibited by emerald cut diamonds.

Bearded Girdle

A girdle that exhibits a number of tiny, hair-like fractures that extend into the diamond.

Bezel Set

In a bezel setting, the diamond or other stone is secured to it mounting via a thin strip of metal rather than prongs. Bezel settings can be of any shape.

Blemish

Blemishes are often seen on diamond surfaces. These external characteristics include abrasions, nicks, extra facets, polish marks, naturals and scratches. Many are not visible to the naked or untrained eye.

Brilliance

The intensity of the white light perceived by the eye when viewing a diamond’s crown, including from external and internal reflections. Clarity, polish, proportions, symmetry and the quality of workmanship are factors that contribute to a diamond’s brilliance.

Brilliant Cut

A round-cut diamond that features triangular and kite-shaped facets that extend from the stone’s center to the girdle edges of its crown and pavilion.

Bruise

an imperfection that breaks a diamond’s surface, usually as the result of hitting a hard surface.

Carat

A unit of weight for diamonds and precious stones. A single carat is equal to 200 milligrams or 0.2 grams.

Chip

A jagged, shallow break that affects value and poses a potential durability problem.

Clarity

A rating that affects price and beauty, and that describes the relative absence of blemishes and / or inclusions in a diamond.

Cleavage

A breakable weak point or fracture, usually caused by weak molecular structure. A cleavage is likely to split if struck in a specific direction. In uncut diamonds, it is used as a natural site for splitting crystals prior to cutting and polishing.

Cloud

An inclusion that can make a diamond appear hazy or milky in appearance when viewed under magnification. Most clouds cannot be seen with the naked eye.

Color Origin

The basis of a colored diamond’s hue, including natural, enhanced, high temperature, and high pressure treated.

Crown

The top portion of the diamond (the table) located above the girdle (the widest point of the diamond), and extending below the table. A diamond’s crown extends from the top of the stone downto the girdle.

Culet

A diamond’s bottom facet, located at its tip. Not all diamonds have culets.

Cushion-Cut

A brilliant rectangular or square-shaped diamond, with curved sides and rounded corners.

Cut

A diamond’s cut refers to how well-proportioned the dimensions of a diamond are, and how these surfaces, or facets, are positioned to create sparkle and brilliance.

Depth

A diamond’s height, measured in millimeters, from its point or culet to its table.

Dispersion

Refers to the separation of white light into different colors, also known as “fire.”

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