Diamond Guide


The 4 Cs

Every diamond, like a human fingerprint, has certain distinguishing characteristics. The 4Cs - colour, clarity, cut and carat weight - are the globally accepted standards for assessing the quality of a diamond. At DEMENTIEV we only accept 0.04% of the world gem grade diamonds.


The unit of measurement of diamond weight is the carat; its name comes from the carob seed that was once used to weight diamonds. The weight is the most important criteria in determining the price of a diamond. A carat corresponds to 0.20g. DEMENTIEV offers diamond solitaires in a large range of carats according to the setting.

All DEMENTIEV Diamond solitaries are certified by GIA.



Among the 4 Cs, the most determining factor is without a doubt the cut of the diamond. It is the guarantee of the exceptional beauty.

DEMENTIEV diamonds whose size is greater than 0.30 carats on the GIA scale are classified "Very good" or "Excellent", guaranteeing them an optimal brilliance and a unique sparkle.


Inclusions are natural imperfections in a diamond that can alter its quality. The clarity of a diamond depends on the number of inclusions, their sizes and their position. The clarity chart put into place by the GIA allows classification from FL ( Flawless = no visible flaws even under a magnifying glass X10) to I3 (imperfect, inclusions visible to the naked eye, also sometimes referred to as Salt & Pepper). DEMENTIEV diamonds are only selected between IF and VS2, which guarantees exceptional clarity and the absence of the slightest inclusion visible to the naked eye.



A white diamond is all the more exceptional if it is colourless. The colour is evaluated by the GIA according to a scale that goes from D to Z in alphabetical order (D signifies a "colourless" diamond and Z "light yellow"). DEMENTIEV diamonds are exclusively selected between D and G, meaning they are all colourless.