| Stone
ID: |
A
Unique number representing your diamond. This
number is registered in a global database. |
| Date: |
The
date the report was issued. |
| Cut
and Shape: |
Shapes
other than the standard round brilliant are called
fancy shapes or fancy cuts. Their names are based
on their shapes. The best known are the heart,
marquise, pear-shaped cut, emerald cut, princess
cut, oval, and radiant. |
| Dimensions: |
The
dimensions of the diamond are stated as "largest
diameter - smallest diameter X depth" for round
shapes and "length X width X depth" for other
shapes. |
| Carat Weight: |
The
standard unit of weight used for gemstones. One
carat equals .200 grams (or 200 milligrams). Usually
abbreviated ct.
|
| Graining |
Graining
and grain lines reflect irregularities in the
crystal structure. Colorless graining usually
does not affect the clarity grade; but white,
colored, or reflective graining does. |
| Proportions: |
Proportion
refers to the angles and relative measurements
of a polished diamond. More than any other feature,
proportions determine a diamond's optical properties.
Studies have shown that table size, crown angle,
and pavilion depth have a dramatic effecton a
diamond's appearance. |
| Depth%: |
The
depth of the diamond divided by the average diameter
for rounds, or the depth divided by the width
of the diamond for other shapes. |
| Table%: |
The
average size of the table facet divided by the
average diameter of the diamond for round shapes,
or the width of the diamond for other shapes. |
| Girdle: |
The
girdle is the outside edge of the outline of the
diamond. The certificate indicates the thickness
of the girdle relative to the size of the diamond,
and the condition either polished or faceted.
|
| Culet: |
The
point at the bottom of the diamond. If the culet
is faceted then the certificate indicates the
size of the facet relative to the size of the
diamond. |
| Finish |
Finish
grades represent the quality of the diamond's
surface condition (polish), and the size, shape
and placement of the facets, including the evenness
of the outline (symmetry). |
| Polish |
Indicates
the care taken by the cutter in shaping and faceting
the rough stone into a finished and polished diamond.
|
| Symmetry |
A
diamond's symmetry is the arrangement of the facets
and finished angles, created by the diamond cutter.
Excellent symmetry of a well-cut and well-proportioned
diamond can have a great effect on the diamond's
brilliance and fire. Grading reports will often
state the diamond's symmetry in terms of Excellent,
Very good, Good, Fair, or Poor. |
| Cut: |
The
proportions and finish of the diamond. With the
proper proportions, most of the light that enters
a diamond is returned revealing the diamond's
brilliance and fire. Any deviation of these proportions
will compromise the beauty of the stone. |
| Clarity: |
Clarity
represents the relative absence of inclusions
and blemishes in the diamond. Clarity is graded
under 10X magnification from Flawless to Included
based on the size, nature, position and quantity
of the diamond's inclusions. |
| Color: |
Assesses
to an obvious yellow (Z) when compared to Master
Color diamonds. |
| Pavillion Depth |
The
distance from the bottom of the girdle to the
culet is the pavilion depth. A pavilion depth
that is too shallow or too deep will allow light
to escape from the side of the stone, or leak
out of the bottom. A well-cut diamond will direct
more light through the crown.
|
| TolkowskyIdeal Cut |
In
the 1920's a Russian Mathematician by the name
of Marcel Tolkowsky calculated the proportions
of the facets in a round diamond that would bring
an ideal balance between brilliance and dispersion.
Any deviation from these designs will compromise
the beauty of the stone. |
| Fluorescence: |
When
exposed to ultraviolet light, a diamond may exhibit
a more whitish, yellowish or bluish tint, which
may imply that the diamond has a property called
fluorescence. The untrained eye can rarely see
the effects of fluorescence. Diamond grading reports
often state whether a diamond has fluorescent
properties. Fluorescence is not considered a grading
factor, only a characteristic of that particular
diamond. |
| Crown Height |
The
crown is the upper portion or the top of a diamond. |
| "Diascript"in
the Girdle |
The
girdle is the outermost edge of the diamond between
the crown and the pavilion. DiamondSafe.com uses
the latest in laser technology to inscribe on
each girdle the EGL Certificate Number. This number
is unique to your diamond. If for some reason
your diamond has to leave your possession, maybe
to be cleaned or set into a beautiful piece of
jewelry, it is possible to check if your diamond
hasn't been switched by mistake.
|
| Diagram: |
A
diagram approximates the shape and cutting style
of the diamond. Symbols on the diagram include
the type, nature, position and approximate size
of a clarity characteristic. |
| Key
to Symbols: |
Lists
the characteristics and symbols shown on the diagram,
if present. Remember, a diamond grading certificate
from a leading gemological laboratory will insure
you get the quality you paid for. |
