Comment choisir son diamant

HOW TO CHOOSE THE DIAMOND

Les caractéristiques du diamant

The price of a cut diamond can significantly vary. To objectively determine its value, four main characteristics, known as the "4 C’s", must be assessed. These are its weight (carat), its color (color), its purity (clarity) and its shape (cut). Each characteristic is evaluated according to its classification scale by international standards. From an aesthetic point of view, they determine the beauty and brilliance of the diamond.

Diamond’s weight

Diamond’s weight is expressed in “carat” and determines its diameter. This is the best known and easiest criterion to refer with when purchasing a diamond. One carat corresponds to 0.20 grams. Below the carat, the weight is referred to fractions; Thus, a label of 0.25 means that the stone weighs 25/100 (the term "25 points" can also be used).

Diamond’s color

Quality diamond’s color is in shades of white. Each stone is rated on a scale from A to Z from snow white to yellow or brown.
The whiter the diamond is, the better it is rated. Stones in champagne tones or light brown have lesser value and are generally reserved for industrial use, but their rating may increase depending on the demand.
Among the other colors called "fancy colors" (blue, green, canary yellow, dark brown), pink differs; usually very pale, it is sometimes argued, and the diamond is worth as or more than pure white. Here is a simple way to assess a diamond’s color: place the gem on a clean sheet, with the culet directed upward towards a cold white source of light or daylight.

Parmi les autres couleurs dites « fancy colours » (bleu, vert, jaune canari, brun intense), le rose se distingue ; habituellement très pâle, il est parfois soutenu, et le diamant vaut alors autant, sinon plus que le blanc pur. Un moyen simple d’apprécier la couleur d’un diamant consiste à le poser sur une feuille blanche, colette dirigée vers le haut en direction d’une source lumineuse blanche et froide ou à la lumière du jour, mais jamais celle du soleil.

Diamond’s clarity

During its formation, due to temperature or pressure variations changes and contact with other natural materials, slight imperfections called "inclusions" are created in the diamond.

Assess a diamond’s clarity involves the study of the number and location of its possible inclusions, and classifying the stone following international standards.

Le « pur à la loupe » désigne les diamants les plus purs, exempt d’inclusions lorsqu’ils sont examinés à la loupe x10 sous une lumière normale. Ensuite, les catégories « VVS (Very Very Small Inclusion) » et « VS (Very Small Inclusion) » regroupent les diamants comportant respectivement de minuscules et de très petites inclusions difficilement repérables sous le grossissement x10. Quand les inclusions sont petites, mais faciles à voir à la loupe x10, on utilise la dénomination « SI (Small Inclusion) ». Enfin, les dénominations « Piqué 1 », « Piqué 2 » et « Piqué 3 » s’appliquent aux diamants dont les inclusions sont facilement discernables à l’œil nu à travers la couronne, et qui peuvent affecter la brillance de la gemme.

The purest diamonds, called "Flawless", have no inclusions when they are viewed under x10 magnification under normal light. Then, "VVS (Very Very Small Inclusion)" means that the stone has tiny inclusions that are extremely difficult to see under x10 magnification. "VS (Very Small Inclusion)" means that the diamond has very small inclusions difficult to detect under x10 magnifications.

When the imperfections are small and easy to see with the x10 magnifier, the grade "SI (Small Inclusion)" is used. Finally, the grades "Included 1", "Included 2" and "Included 3" are used when the diamond contains inclusions that are easily visible to the naked eye through the crown. These imperfections may affect the brilliance of the gem.


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