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The purity of diamonds and gemstones

Impurities called inclusions in gemstones are even more annoying and visible if the color of the stone is clear and its brightness low, the diamond's brilliance reduces the effect of small inclusions.

Completely pure gems do not exist... we quantify the inclusions by examining the stones with a loupe with a magnification of 10x and positioning the stone on a scale from purest to less pure.

An internationally agreed codification can position a stone on this scale.

 

IF
Internally Flawless

Pure stone, no inclusions visible under 10x magnification.

 VVS Very Very Small inclusion(s)

Very very small inclusion(s) or blemishes very difficult to see under 10x magnification.

The number and position of tiny inclusions can codify stones "VVS1" and "VVS2".


 VS Very Small inclusion(s)

Very small inclusions easily visible under 10x magnification but invisible without magnification.

The number and position of very small inclusions or blemishes can codify stones "VS1" and "VS2".


 SI Small Inclusions

Small inclusions visible with 10x magnification, almost invisible to the naked eye.

Shade "SI1" and "SI2" depends on the nature of the inclusions, their number and their position in the stone.

In general, these inclusions do not affect the brilliance of diamonds.
SI3

This classification is not recognized by the major laboratories issuing certificates of authenticity, it corresponds to an intermediate position between "SI" and "I".
I
Included

Gemstones containing inclusions easily visible under magnification10x and with an experienced naked eye.

The number, size and position of inclusions determines the codification "I1" or "I2". These inclusions affect the brilliance of the diamonds especially the "I2".

"I3" the size of inclusions visible to the naked eye disrupts the brilliance of the stones.

Sometimes we use the term " piqué " instead of "I",  then we get "Piqué 1", "Piqué 2" and  " Piqué 3".