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What’s a diamond ?

A diamond is a crystallized mineral composed of Carbon (C). In nature diamond comes in a variety of crystalline shapes. Usually the diamond crystallizes in a octahedral shape. The diamond is the hardes mineral on earth because it’s able to damage any other substances ant it can only be scratched by another diamond. The hardness of the diamond is due to the tetrahedron structure. The extraordinary brillance and play of light in a diamond is the result of it’s high refractive index ( ratio that describes the change in the speed and angle of light as it passes from one material to another ) .


How to value a diamond ?

While many may argue that beauty is highly subjective and in the eye of the beholder, the GIA (Gemmological Institute of America ) has put in place an universal grading system known has the 4C system.

  • Color
  • Carat
  • Clarity
  • Cut

First C (Color) The color of a diamond is graded on a scale starting to D (exceptional white ) until Z . However diamond can have any color.


The second C ( Carat ) is the weight of a diamond is expressed in carat (1 carat = 0.2 gram ).

The third C ( Clarity) the size and the position of the inclusions in the diamond determines is purity. We check the clarity with a 10X magnification loupe.


The fourth C ( Cut) is the shape of the diamond. Good proportions are important for the brillance and the fire in the diamond.

18 janvier 2018