The
Gemological Institute of America (GIA) is considered
the world's leading authority on gemology. Founded
in 1931, this non-profit institution developed
the famous four C's method of grading diamonds.
They are well known for their gem grading and
identification services, not just in diamonds.
They are considered the most unbiased and accurate
in the field, usually giving conservative grading.
Diamonds with a GIA certificate normally sell
at about three to five percent higher than other
gems because of this guaranty of quality.
The European Gemological Laboratory is an independent
laboratory, considered one of the premier in
the industry worldwide. Though not as strict
as the GIA in their grading reports, they are
usually reliable and provide a more detailed
report than the GIA in terms of the proportion
of the diamond you purchase.
The American Gem Society Laboratory (AGSL)
was founded in 1996. Just like its parent organization,
the American Gem Society, the AGSL is dedicated
to setting a new standard in the grading industry.
They aim to provide consumers (the couple who
will be the final owners of the stone) with
reliable, unbiased and creditable reports on
the quality of the diamonds that they purchase.
They are considered the top in the field for
grading the cut of a diamond; in fact they are
the often the preferred laboratory if the gem
in question is being certified as an ideal cut.
The International Gemological Institute was
founded in 1975 and is one of the leading gemological
institutes worldwide. They seek to provide the
consumers with a reliable report on their diamonds.
As they see it, without a certification, a diamond
has no history, it is just a gem. The certificate
is the equivalent of the passport of the gems
and jewelry that they certify.
As the consumer, it will now be your task to
check that you are being given the right certificate.
Check that the name of the laboratory that certified
your gem is one of those listed above. One diamond
scam to keep your eyes open for is having certificates
from laboratories with similar initials as those
of the above institutions. You may end up with
a certificate from the Gemological Institute
from Antarctica which is not what you need at
all.