Diamonds are submitted to an analysis of color, this analysis is done by the comparison of them with stones called Master Color.
Master Color stones are accepted and recognized all over the world.
Most Diamonds on sale seem colorless, others can have tones of yellow or brown, these gems are called Champagne Diamonds.
Only rare gems can have different colors: green, blue and pink, in this case they are not estimate by the scale of colors, but they are called “Fancies”.
Most diamonds contains very small traces of material that has not crystallized, or they have material which is not carbon, like the rest of the diamond. That renders them virtually unique. Generally, it is impossible to see these impurities with the naked eye, only the loupe used by the the jeweler can find these impurities. The more a stone is without impurities, the more valuable it is.
If= Internally flawless, that is nothing visible at the diamond scope
Vvs 1\2= Very, very small inclusions, very often they are invisible even with the jeweler’s loupe.
Vs 1\2= Very small inclusions, the stone has inclusions visible with a loupe, only an expert eye can see them.
Si 1\2\3 = Small inclusions visible with the loupe, but not with the naked eye.
P 1\2\3= Pique the stone has inclusions visible with the naked eye (in category 1 only an expert eye can see them)
The weight establishes the price of a diamond and it is measured in “carat”. The word carat derives from the ancient system of weighing that used the seed of carob bean as a unit of measurement. Later, the carat was fixed to 0,2 grams. A carat is divided by 100 Points, so 25 points (0,25 Kt.) are equal to 1\4 of carat.
Normally, the surface of a gem is cut into flat faces, known as facets. The cut gives to the diamond it’s brightness. Only expert hands can modify the beauty of a stone. See the illustrations above.