1. Diamond Clarity
Nearly every diamond contains some external blemishes or internal inclusions that can be detected with
magnification. To the extent that diamonds are free of these characteristics they are more rare and
valuable. Diamonds with higher clarity or "purity" are more expensive than diamonds with lower clarity
and more imperfections. In addition to being rarer, stones with higher clarity are capable of reflecting
and refracting light better.
Diamonds are graded for diamond clarity based upon the number, size and location of these tiny
inclusions. They also serve to create a very unique identifying signature for a specific diamond, much
like a fingerprint.
The diamond clarity grading system most widely used around the world is the GIA scale. Professional
grading is done in controlled conditions under 10X magnification.
It is helpful to think of clarity in terms of grade ranges with the following descriptions.
Clarity Descriptions
Abbreviation Definition Description
Flawless stones have no external blemishes or internal inclusions when
Flawless -
examined by an experienced grader using 10X magnification. Internally
F, IF Internally
Flawless diamonds have no inclusions under 10X magnification but have
Flawless
minute external blemishes.
Very, Very Contains minute inclusions that are difficult even for an experienced grader
VVS1, VVS2
Slightly Include to see under 10X magnification.
Very Slightly
VS1, VS2 Contains minor inclusions observed with effort under 10X magnification.
Included
SI1, SI2, *Si3 (not Slightly Contain inclusions that are noticeable to an experienced grader under 10X
used by GIA) Included magnification. Almost always clean to the naked eye.
Contain inclusions obvious under 10X magnification. Inclusions may affect
I1, I2, I3 Included
transparency, brilliance and even durability.
Practical advice:
For jewelry purposes Si2 clarity is sufficient to allow for brilliance and performance. Even close
examination with the naked eye will not reveal any flaws in most cases. For engagement purposes many
buyers prefer stones with higher purity. Selecting Si1 or Si2 rather than a higher grade can enable a
buyer to own a larger and/or better color diamond for the money without a substantial drop off in
beauty or performance.
http://www.whiteflash.com/about-diamonds/diamond-education/diamond-clarity.htm
