The primary factors that determine the price of Diamond stone are 4c i.e Cut, Carat, Color and clarity. We already explained the 4c in this link. Now we will explain the secondary factors that are involved in the price of Diamond gemstones.
Apart from the 4 C’s, there are a number of other factors that tell us how to determine diamond value. These are not as major of factors though they do have an effect.
The culet is the bottom point of a diamond. Usually slightly flat or faceted, the culet affects the light performance of a diamond. The culet size and angle are two main factors, which can have a significant effect on the value of a diamond.
The ideal culet should be positioned in the exact center of the bottom of the diamond and should be of a small size. Angle deviation and increase in size both adversely affect the diamond.
The thickness of the girdle or the edge that is formed where the top (crown) and the bottom (pavilion) of the diamond meet, could potentially have a negative effect on the value of a diamond. The unequal thickness of the girdle will undermine the symmetry of the diamond, which is essential for light performance.
There is a lot of controversies attached to the effect of laser inscriptions on the value of a diamond. Laser inscription causes microscopic indentations on the surface of the diamond itself, marring it with imperfections.
Therefore, it should have an effect on the clarity of the diamond and thus on the overall price value. However, ironically, as most certification companies inscribe the diamonds themselves, they have the ability to exclude them from the grading altogether.
Each of the 4 C’s is extremely important. A 1-carat diamond that is internally flawless, perfectly cut and “D” color could be worth over $20,000. On the other hand, a diamond of the exact same size that is significantly included has a “good” cut, and a “J” color could be worth under $3,000.
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