Glossary of Diamond Terms and Abbreviations
This quick reference guide contains common diamond terminology and their meanings. Use the letter links below to quickly find a diamond terms.
Glossary of Diamond Terms
Blemish: An imperfection on a diamond’s surface that may or may not be recognizable.
Brilliance: The amount of white light reflected that radiates from the diamond’s surface. The properly proportioned cut equals a more brilliant diamond.
Brilliant Cut: A round diamond that measures 58 facets.
Carat: Measurement used for scaling the weight of a diamond. One carat is equal to one fifth of a gram.
Clarity: A graded scale that measures the amount of imperfections within a diamond. The ranges from flawless (FL) to severely included (I3).
Cloud: A minor inclusion within a diamond.
Color: Color tones of a diamond that are graded on a scale of D (colorless) to Z (yellow brown).
Culet: The bottom point of the diamond which may or may not contain a facet.
Cut: The proportion of angle and geometric shape that encompasses both shape and percentage of stone. Determines the stone’s sparkle and radiance capabilities.
Ideal Cut: A round diamond that is perfectly proportioned. See Hearts and Arrows.
Very Good Cut (Premium): A proportioned cut that maximizes brilliance, reflection and fire. Meets the highest standards and dimensions for a quality diamond.
Good Cut: An acceptable and more reasonably priced cut with decent proportions.
Fair Cut: While still capturing some sparkle, this cut is made to maximize the diamond’s carat weight.
Poor Cut: A clearly dull and lifeless diamond that sacrifices proportion and quality.
Depth: A diamond’s height from culet to table.
Depth %: Height divided by width. Determines brilliance and sparkle.
Eye-clean: When viewing with the naked eye, a diamond with no visible inclusions or imperfections.
Facet: A diamond’s flat, polished surfaces.
Fire: Reflected color light that radiates from the inside, out.
Fluorescence: When exposed to ultraviolet light, an illuminating bluish color that glows from the diamond surface,
which usually doesn’t affect appearance or quality.
Girdle: A diamond’s narrow band that encircles the width.
Inclusion: An imperfection within a diamond that typically manifests in the crystal. May or may not be visible to the naked eye but noticeable when magnified.
Make: The diamond’s cut proportions. The better the make, the better the diamond.
Pavilion: A diamond’s bottom portion.
Point: One hundredth of a carat.
Polish: The external finish of a stone, which ranges from excellent to poor.
Sparkle: The amount of reflected light that radiates from a diamond’s surface and combines both fire and brilliance.
Symmetry: The overall unity and proportion of a stone’s cut. Symmetry ranges from poor to excellent.
Table: The top of the diamond that carries the largest facet of the diamond.
Table %: The total diameter of the diamond that divides the width of the table and is critical in determining the sparkle of the stone.