Reports issued for diamonds by the GIA are renowned for
their promise of integrity and authenticity and are respected highly across the
world. This laboratory issues a wide range of reports in different report
formats for diamonds. While all reports provide detailed information on the
vital 4Cs of each individual diamond, they are issued in different formats
depending upon the stone.
Diamond grading report
Diamond grading reports are provided usually for diamonds
over one carat and provides important information encompassing diverse aspects
of the stone. Besides the GIA grading report, the GIA grading
report with cut gradecan also be
opted for. If the customer opts for additional micro inscription on the
diamond, its details are also provided in the comments section of the report.
GIA Grading with Cut Grade
Diamond dossier reports
The GIA diamond dossier
is usually issued for diamonds under one carat and it provides information
similar to the grading report. Unlike grading report that levies extra for
laser inscription registry, the diamond dossier provides it free of charge.
Thus details of the GIA report number micro-laser inscribed on the diamond at
the buyer's request. Important limitations regarding the report are given at
the back. The GIA
diamond dossier with cut grade can also be availed of.
Details provided in
GIA reports
While reports are provided in different formats, depending
upon the weight of the stone and its type, the following details are present in
each GIA report.
Report number: A unique number assigned to a diamond
and registered in GIA's global database.
Shape and cutting style: Details the shape of the
diamond and how the various facets are cut.
Measurements: This
includes dimensions of the diamond as minimum diameter - maximum diameter x
depth (for round diamonds) or length x width x depth (for fancy shapes).
Weight: This is provided in
carats
Proportions: Various characteristics of the diamond
are underlined here. These include,
Table: Average size of the
table facet in relation to the average diameter (for round diamonds). For fancy
shapes this is measured as width of the table facet in relation to the width of
the diamond.
Depth: For round shapes,
this denotes the depth of the diamond with relation to the average diameter.
For fancy shapes, this refers to width of diamond.
Girdle: Thickness of the
girdle with relation to size or condition (faceted or polished) of the diamond.
Finish: This grades the polish and symmetry of a
diamond, size, shape and placement of facets.
Culet: Details the size of the culet relative to size
of diamond.
Polish: This provides information on the smoothness
of the diamond and its overall condition.
Reference Diagram: This approximates the shape and
cutting style of the diamond. It also indicates clarity characteristics in the
stone. Key to symbols used on the diagram is also provided.
Proportion diagram: A graphic profile representation
of the actual diamond's proportions is provided here.
Grading scales: GIA grading scales on color and clarity
are provided. The clarity grade provides grading on a scale which lists from
flawless to included. Color grading is provided on a scale from colorless to
light yellow, brown or gray. Color grading is achieved by comparing stones to
master comparison diamonds.
Security features: To ensure that the certificate is
secure and cannot be forged, GIA certificates come with certain security
features. These include hologram, watermark, an embossed seal, chemical
sensitivity feature, microprint lines and security screen are also provided to
ensure that the certificate is original.
Other details: Other details include date of issue, degree
of clarity, color, fluorescence and measurements of the diamond.
Other features
The laboratory also issues special reports designed specifically
for colored
diamonds.
Color Grading Report
GIA also offers the Gem identification report whereby reports are
issued on the different gems such as sapphires, rubies, emeralds etc. It also
provides services like the Report Check which allows users to easily confirm
whether the information on their certificate matches the information archived
in the GIA online databases. This service is currently provided for diamond
grading reports and dossier reports issued after January 2000.
Limitations
GIA reports have certain limitations that customers must be
aware of. These are,
The
laboratory does not grade mounted diamonds. Only loose diamonds must be
sent to GIA for grading.
The
certificate does not provide retail value of the diamond. These details
are only provided in diamond appraisals that provide information on all
4Cs while also suggesting an approximate retail value for the stone.
The
report is simply a detail of the diamond characteristics and is not a
guarantee on the stone.
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