A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

A

Anatomy
Diamond anatomy refers to the various parts of a diamond and how they are cut. This is part of the diamond’s cut grade.

Appraisal
Diamond appraisal is obtained after a thorough inspection of characteristics of the diamond.

Asscher Cut
Asscher cut diamonds look similar to emerald cuts. They are more square than rectangular. They have been described as "an endless hallway with reflective mirrors."

B

Blemish
A blemish is an imperfection on the diamond’s surface.

Bow Tie
Bow Tie, also called the butterfly effect, is the appearance of a dark shadow that sometimes appears in fancy shaped diamonds and can often be seen with the naked eye.

Brilliance
Brilliance refers to a diamond cut in a particular form to that of a cone, providing maximized light to return through the top of the diamond.

Bruise
An impact or concussion mark on the surface of the diamond may create small lines inside the stone. This can affect the clarity grade.

C

Carat
Carat is the weight of a diamond.

Carbon Spots
Carbon spots are blemishes present within a diamond. They are usually seen as black spots. They can be seen by the naked eye or, in some cases, only by microscope.

Cavity
A cavity is an indentation on a stone surface.

Certification
A certification is a document of all grades, plots, and traits of a diamond.

Chip
A chip is a shallow nick on the diamond that is created during the cutting process.

Clarity
Clarity is rated on grading scales to measure the amount of imperfections in a diamond from (FL) Flawless–Severely (I3).

Cleavage
Cleavage refers to breakage in a diamond along certain definite directions, producing (more or less) smooth surfaces.

Cloud
Cloud refers to minor inclusion(s) within a diamond.

Color
Color refers to the graded color tones of a diamond, based on a scale of D (colorless) to Z (Yellow Brown).

Crown
The crown is the upper portions of a diamond that lie above the girdle. This includes the table facet surrounded by the other upper-girdle facets.

Cloud
Cloud refers to minor inclusion(s) within a diamond.

Crown Angle
Crown angle refers to the facets that intersect the girdle plane. The slope helps create fire in a diamond.

Crystal
A crystal is a mineral deposit found inside of a diamond. It can be alone or in groups and can be colored or colorless, but appears black in overhead lighting.

Culet
A culet is the bottom point of a diamond.

Cut
Cut refers to the proportions and finish of a polished diamond.

D

Depth
Depth is the height of a diamond from the culet to the table and is measured in millimeters.

Depth Percentage
The depth percentage is the diamond’s height divided by width. This determines the brilliance and sparkle of a diamond.

Diamond
A diamond is a precious stone comprised of pure carbon (a naturally occurring substance).

Diamond Plot
A diamond plot is a mapping of a diamond’s interior and exterior flaws.

Diamond Treatments
Diamond treatments are a variety of techniques used to improve the natural clarity of a diamond. The GIA does not certify diamonds that have been laser drilled or fracture filled.

Dispersion
Refers to smaller facets angled downward and at different degrees, allowing the design to break up white light when it hits the surface. Dispersion is also called fire.

E

Emerald Cut
An emerald cut diamond is a square or rectangular-shaped diamond with cut corners.

Eye-Clean
Eye-clean refers to a diamond with no blemishes or inclusions that are visible to the naked eye.

Extra Facet
An extra facet is any facet that is not part of the shape’s standard cut. This is acquired by the cutter due to a limitation or flaw in the original rough stone.

F

Facet
A facet is a diamond’s flat and polished surface.

Fair Cut
Fair cut is a cut that reduces fire and brilliance due to light entering the diamond and escaping from the sides or bottom of a diamond.

Fancy Shape
A fancy shape is any diamond shape other than round.

Feather
A feather is a small fracture in a diamond caused by distress while the diamond was growing underground.

Finish
A finish is every aspect of a diamond’s appearance that is not a result of the diamond’s inherent nature when it comes out of the ground.

Fire
Fire is a reflected colored light that radiates from the inside out. See dispersion.

Fluorescence
Fluorescence is an illuminating blueish color that glows from the diamond’s surface when placed under a UV light.

G

GIA
Gemological Institute of America is a non-profit educational institution that specializes in diamonds and their certification.

GIA Certificate
An in-depth lab report of a diamond, including a map of the diamond inside and out along with grades upon which the diamond is graded.

GIA Dossier
GIA Dossier is an abbreviated certification of the GIA Grading report. This certification is used for smaller diamonds.

GIA Grading Report
A GIA grading report comprises an assessment of 4C’s (color, clarity, cut, and carat) and a plotted diagram of a diamond’s proportions and characteristics.

Girdle
The girdle is the outer edge of the diamond where the crown meets the pavilion.

H

Heart Shape
Heart shaped diamonds are modified cuts used as a unique and unmistakable symbol of love. Symmetry is very important concerning heart shaped diamonds.

I

Inclusion
An inclusion refers to an internal flaw in a diamond.

L

Laser Inscription
A laser inscription is a text etched in the girdle of a diamond by laser.

Length to Width Ratio
Length to width ratio refers to the calculations of a diamond, taken by dividing length (longer measure) by width (shorter perpendicular to length).

M

Make
Make refers to a diamond’s cut proportion.

Marquise Cut
Marquise cut is a fancy shaped diamond elongated with points at each end.

Measurements
Measurements refer to the length, width, and depth of a diamond in millimeters.

Mohs Scale
Mohs Scale is used to compare hardness of various natural minerals. Based on the scale of 1-10 diamonds are rated 10.

N

Natural
Natural refers to the small remains of rough stone unpolished surface of a finished diamond, showing the original natural part of the diamond.

Needle
A needle is a fine elongated inclusion, similar to a feather, in a diamond.

O

Oval Cut
An oval cut diamond is a modified brilliant cut that is elongated. This makes the finger appear longer and slimmer.

P

Pavilion
The pavilion is the entire portion of the diamond that sits below the girdle.

Pavilion Angle
The pavilion angle is the number of degrees between the plane of the table and the pavilion facets.

Pear Shape
A pear shaped diamond is a modified brilliant cut that combines the round and marquise shape with a tapered point on one end.

Pinpoint
A pinpoint is a tiny crystal found inside a diamond. When clustered together, pinpoints can form a cloud in the diamond.

Point
A point is a measurement used to describe the weight of diamonds. Every point is equal to 1/100th of a carat.

Polish
Polish refers to the smoothness of each facet of a diamond.

Princess Cut
Princess cut diamonds are fancy cut diamonds that are traditionally square, but many are slightly rectangular.

Proportion
Proportion refers to the relationship between the size, shape, and angle of each facet of a diamond.

R

Radiant Cut
A radiant cut diamond is a brilliant cut fancy shape that resembles a square or rectangle shape with the corners cut off.

Ratio
A ratio is how much longer a diamond is than it is wide.

Round
A round cut is a brilliant cut. It contains 58 facets or 57 if there is no culet.

S

Shape
There are 10 diamond shapes–round, princess, oval, marquise, pear, cushion, emerald, asscher, radiant, and heart.

Single-Cut
Single-cut diamonds are tiny round diamonds that only have around 16-17 facets. These are normally seen more in pave jewelry or small set diamonds.

Sparkle
Sparkle refers to the amount of reflected light that radiates from a diamonds surface and combines both fire and brilliance.

Step Cut
Step cut refers to the flat places in the diamond that resemble stair steps. There are three rows of facets arranged around the table and on the pavilion.

Symmetry
When concerning a diamond’s symmetry, there are many varieties, such as the misalignment of facets or facets that fail to point at the girdle (undetected to the naked eye).

T

Table
The table is the flat facet on the top of the diamond.

Table Percentage
Table percentage refers to the diameter of the table facet compared to the diameter of the entire diamond.

Trillion Cut
A trillion cut diamond is a brilliant fancy shape that is triangular.

Y

Yield
Yield refers to the weight of finished diamonds cut from the rough stone. For example: there is a greater yield cutting a two carat diamond from a three carat diamond than a two carat diamond from a six carat diamond.

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