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Diamond Certificate Glossary
By EGL International,
(European Gemological Laboratory),
Ramat Gan, Israel
http://eglinternational.org/diamond-certificate-glossary.html
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Below is a list of terms are commonly found on diamond certificates.
Term |
Definition |
4C's |
4 criteria used for diamond
grading and certification |
5th C |
Refers to the diamond
certificate |
Diamond Carat |
The weight of the diamond.
1 carat = 0.2 grams |
Diamond Certificate Number |
The serial number of
the diamond or gemstone for which the certificate is issued. |
Diamond Clarity |
Indicates how "pure"
the diamond is, meaning whether it has any blemishes
or inclusions. |
Diamond Color |
Diamond color is graded
on a scale of D-Z and indicates how colorless or "white"
the diamond is. The closer to D the diamond, the more colorless it
is and more valuable. |
Diamond Cut |
Describes the outline
or shape of the diamond such as: round brilliant, emerald cut, pear,
oval, princess cut. |
Diamond Finish |
Grades the polish
and symmetry of the
diamond. |
Diamond Measurement |
Length, width and depth
of the diamond in millimeters. |
Diamond
Polish |
Refers to how smooth
the surface of the diamond is and whether marks remain from the polishing
process. |
Diamond
Symmetry |
Refers to how accurately
opposing facets have been
placed and shaped, they should be a mirror image of each other. |
Diamond Proportion |
The size of the various
facets and the angles at
which they lie relative to each other. |
Diamond
Facet |
A smooth surface of the
diamond. |
Diamond
Pavilion |
The facet below the girdle. |
Diamond
Girdle |
The widest part of the
diamond. |
Diamond Crown |
The facet
above the girdle. |
Diamond Culet |
A tiny flat facet
that cutters sometimes add at the bottom of a diamond's pavilion
to protect the tip. |
Diamond
Inclusion |
Features enclosed within
a gemstone or extends into it from the surface. |
Diamond
Blemish |
External features, confined
to a gemstone's surface. |
Published - June 2011
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