These 4 Cs stand for:

  1.      Carat: It is the unit of weight, carat. Cts is how you write it and 1ct is equivalent to one fifth of a gram.
  2.      Color: It measures the colour of the diamond.
  3.      Clarity: Measures the level of impurity of the diamond.
  4.      Cut: Measures the symmetry, proportions and the diamond’s polishing.

With these parameters we can make an easy analysis of a diamond. If your diamond is big, with a rare colour and well sculpted, it will be worth a lot more than if it didn’t !

Basic notions to understand a diamond certificate:

Inside a certificate we’ll find the following information:

  • Number of certificate Corresponding to laboratory and date of issue.
  • Form and type of stone carving (round, rectangular, oval, heart…).
  • Measures expressed in this way: smaller diameter x diameter x height increased.
  • Grading 4Cs results. Measurement of the four variables:
  1.      Carat weight
  2.      Color grade
  3.      Clarity grade
  4.      Cut grade
  •   Additional information:

Here appear very different, but important data to determine the quality and price of the diamond. Such as:

  1.      Finish
  2.      Simetry
  3.      Fluorescence

In a certificate, we will find a number of measures that will provide us with adequate information to determine the quality of a diamond’s size.

The quality of the carving encompass other measures and angles, we have three different terms :

  1.      Cut grade
  2.      Symetry
  3.      Polish

These three terms will come classified as :

EX- Excellent
VG- Very good
G- Good
Fair
Poor

Sizes and Angles:

The terms are:

TD- Depth – Height: Ideal measures between 60 and 63 %
Table TS- Size- Ideal measures between 56 and 60 %
PD- Pavillion - Ideal measures between 43 and 44 %
CH -Crown Height - Ideal measures between 13 and 15 %

The listed angles are:

CA- Crown Angle- Ideal girdle -33.5 to 34.5 °
PA- Angle- Ideal girdle -40 to 41.5 °

Girdle and Culet

In a certificate we are also going to suggest two very important details of the stone, such as the thickness of the girdle and the culet termination:

  • Girdle Girdle: Can be: fine ( thin) average ( medium ) – thick – very thick
  • Culet: Normally NONE of FACET.

These two details, even if they seem otherwise, are very important, since a faceted culet, imply a worsening in termination and brilliance of the diamond, since the light would pass through it. In addition, a very thick girdle imply that the stone weighed more, which would not have an adequate correspondence between weight and size.