Education

Color

The diamond's color has a great influence on the diamond's lucidity, there are two separate groups of diamonds – White and Fancy, Those groups have two separate scales to estimate their worth.

White Diamonds – The diamond's color is on the scale between D-Z.

The scale start with the letter D which symbolize a colorless diamond which are extremely rare and goes down to Z which symbolize a light yellow diamond which still doesn’t count as a Fancy diamond, these diamonds are not very popular in the industry and usually cheap.

Cut

The value of the diamond increases as the level of the cut increases as well, the target of the cut is to enable reflection from different angles in order to inflict the diamonds shine from every possible angle and light.

To achieve this result all of the angles must be centered and symmetrical, asymmetry will reduce the final result.

Nowadays there are many advanced computerized methods to determine the diamonds cut grade.

Carat

Carat is a unit equals to 0.2 grams and is used 

for measuring diamonds, carat refers to the diamond's weight and not its size like most people believes.

Clarity

The diamonds clarity refers to the defects and inclusion's inside and on the diamonds surface.

The clarity grade is set by the defects, their size, eye visibility etc.

FL (Flawless) – Diamond without any inclusion or defects visible to a gemologist with a 10X magnification.

IF (Internally Flawless) – Diamond without any inclusion's, only defects visible to a gemologist with a 10X magnification.

VVS1 (Very Very Small Inclusion's 1) – Diamond with tiny inclusion's, not visible to the naked eye, very difficult to spot with a 10X magnification, level  1.

VVS2 (Very Very Small Inclusion's 2) – Diamond with tiny inclusion's, not visible to the naked eye, very difficult to spot with a 10X magnification, level  2.

VS1 (Very Small Inclusion's 1) – Diamond with small inclusion's, not visible to the naked eye difficult to spot with 10X magnification, level 1.

VS2 (Very Small Inclusion's 2) - Diamond with small inclusion's, not visible to the naked eye difficult to spot with 10X magnification, level 2.

SI1 (Slightly or Small Inclusions 1) – Diamond with tiny inclusion's, easy to spot by an expert gemologist with 10X magnification, level 1.

SI2 (Slightly or Small Inclusions 2) - Diamond with tiny inclusion's, easy to spot by an expert gemologist with 10X magnification, level 2.

I1, I2, I3 (Imperfect or Included 1,2,3) – Diamond with visible inclusion's, very easy to spot with 10X magnification and even to the naked eye, those inclusion's and defects might affect the diamond's lucidity.

Polish

The quality of the diamond's polish has a direct effect on its appearance and its price.

Polish describes mainly the facet smoothness and should be without any defects like scratches, burn marks, polish lines, nick's etc, the smoother the diamond's polish the more shiny and beautiful it will look, on the other hand poor polished diamond's will appear blemished and will lose its brilliance.

The polish scale starts from Excellent to poor polish, polish between Excellent and good will not be visible to the naked eye.

Symmetry

The diamond's symmetry refers to the facets of the diamond and its alignment.
A part of the symmetry grade also includes the culets, tables, facets and girdles.
A diamond with poor symmetry might misdirect the light from the diamond and reflect the light at a wrong angle, 
poor symmetry can cause lose of shine and brilliance.