The price per carat is the not the same regardless of the weight of the stone: i.e. that a 2 carat stone price is much higher than 2 stones of 1 carat each, 7 other criteria being the same.
Clarity grades are determined by the size, position, brightness and number of inclusions.
The most frequently found color of diamonds is white.
The colorless diamond is the most popular.
The diamonds reflect the light and break it into a rainbow of colors.
This small reflection of color, has no effect on the technical evaluation of the color.
Rare diamonds without a trace of color are graded D.
This grade can vary from D to Z depending on the intensity of color, starting from absolutely no color to light yellow, brown or grey.
The color of a diamond is affected by chemical impurities and/or structural defects in the atomic structure of the carbon crystal.
The grading of the diamond’s color can only be executed on a single, unmounted stone. To determine the exact hue present in uncolored diamonds, a certified comparison diamond is used, which is presented by the GIA. The stones are examined in special white lighting. The stones used for comparison are chosen with the help of numerous criteria.
GIA / Grade
– D – exceptionally white
– E – exceptionally white
– F – extra white
– G – extra white
– H – white
– I – white with slight trace of color
– K – slight hue
– Z – hue
The most common shape is the round one or “brilliant cut”. With 57 facets it is the form that returns the most light and is the best selling and most expensive.
Each diamond shape must meet specific characteristics of proportions between its different facets to reflect and diffract light optimally.
Similarly, the dimensions of facets and angles they form between themselves must be perfectly balanced to give the stone its maximum brightness.
No imperfections resulting from the size, no trace of rough diamond on the facets must not stand to avoid any obstacles in the path of the light.
Contrary to what one might think, the most common diamonds are fluorescent and the rarest are not.