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The SayIDoDiamond Dictionary


Bezel - The bezel is the part of a cut stone that protrudes above the edge of a setting. The bezel is also known as the crown.

Bearding – Very tiny fractures that start at the girdle and extend into the rest of the diamond.

Blemishes – Blemishes are located on the surface of a diamond and interfere with light passing through the diamond as well as its ability to transmit light.

Brilliance – The amount of light that is reflected from the diamond’s surface, through it’s interior.

Carat (ct) – The unit of measurement used to weigh diamonds (Also known as the metric carat or mct). Often times, a carat is subdivided into 100 equal parts known as a point (pt) (e.g. a one carat diamond is also known as a one point diamond.

Cavity – A large or deep opening on a diamond that originates at the diamonds surface.

Characteristics – Inclusions or blemishes on/in a diamond.

Chips – A small opening in the diamond, often curved or rounded (usually are caused accidentally during the handling process).

Cleavage – A break inside the diamond in a relatively weak direction of the diamond crystal.

Cloud – A number of tiny inclusions due to irregular crystal growth as the diamond grew. They typically form a cloudy-like (milky) area on the stone.

Crown - The area above the girdle is called the crown; the facets on the crown are the table, the star facets, the kite (or bezel) facets and the upper girdle facets.

Crystals – A mineral crystal caught in the diamond as the diamond grew.

Culet - The facet at the tip of a gemstone. The preferred culet is not visible with the unaided eye.

Dispersion – The splitting of light into spectral hues, also known as fire. (typically known as the rainbow effect).

Facet – A gemstone’s flat, polished surfaces.

Feather – A break inside the diamond. Typically has a white, feathery look. Categorized in 2 ways: Cleavage and Fracture (see cleavage and fracture).

Fire - The splitting of light into spectral hues, also known as dispersion. (typically known as the rainbow effect).

Fracture – A break inside the diamond. A fracture typically has a jagged look.

GIA – Gemological Institute of America. The GIA is the creator of the 4 C’s (Cut, Clarity, Carat and Color)

Girdle – The diamonds outer edge. Also known as the area where the crown and the pavilion meet.

Inclusion – An internal imperfection to a diamond.

Knots – An included diamond crystal reaching the surface of a polished diamond.

Loupe – A magnifier used to examine a diamond. Typically a 10X loupe is used.

Pavilion – The lower part of the diamond that forms a V shape.

Pinpoint – An extremely small included crystal. This type of inclusion is often seen as a tiny white speck under magnification.

Pits – Typically explained as a tiny cavity. It is a small and shallow opening in the diamond.

Polish – Polish is very important to a diamonds’ brilliance. The polish influences the ability of light to pass through the diamond.

Scintillation – The diamond’s intense sparkle as it moves.

Symmetry – The exact positioning, shape and arrangement of facets of a stone. The ideal is a mirror-like balance from one side of the diamond to it’s opposite.

Table – The largest and most prominent facet. This is typically the top of the diamond, thought to resemble a table.