The gemologist expertise

The gemologist expertise
Marc-Arnaud Pavageau

The gemologist expertise,
a quality guarantee

The expertise of a gemologist will identify the precious stones, semi-precious, ornamental or organic materials (ivory, coral, pearls, etc.) whether natural, synthetic or processed. This expert work requires specific equipment and both technical and scientific skills. It is because each stone is unique that the expertise of the gemologist is essential in the purchase of a gemstone or a jewel.

Buying a jewel from a jeweler-gemologist is the guarantee of having high quality gems.


Marc-Arnaud Pavageau,
a work dedication

The gemologist’s know-how must combine not only the expertise, but also a long-term experience and a real passion for the job.

How to choose
your stone?

The selection criteria

The value of a stone will depend on many determining criteria. For colored stones, their origin and provenance will determine their color and therefore their price on the market. The jeweler-gemologist will focus on the brightness of the stone and the depth of colors. Each stone is unique. The hue, the inclusions specific to each material, as well as the symmetry and the polishing of the size will be criteria of choice for your stone. Inclusions and secondary tints will also impact the market value of the stone, as well as its size and weight.

The diamond, meanwhile, is relatively easier to assess, weight, size, color, purity, especially if it is accompanied by a certificate.

The 4C standard

Clarity, Cut, Carat, Color, the diamond ID

To help you in your choice, You should refer to the international diamond standards that determine the value of a diamond and guarantee the quality of your purchase.


The size of the stone maximizes the brilliance of the diamond.


Diamond color variations range from D to Z, from whitest (D, E, F, G, H)
to tinted to yellow (I, J to Z).


Purity is measured by the number and size of inclusions in the stone.


The weight of the diamond is expressed in carat. 1 carat equals 0.20 grams. Diamond is the rarest stone. You have to brew up to a ton of land to get a single carat!


In addition to the 4Cs, there are other criteria that must be considered: symmetry, polishing, proportions, fluorescence (a fluorescent diamond under the UV will be estimated cheaper). A GIA, HRD or IGI certificate is given to you with any diamond purchase starting at 0.30 carat.