How do slight differences in the 4C’s affect a diamond’s value?

The nature of diamonds is such that even a very SMALL variation in any of the 4 C’s will have a significant effect on value. To give you an idea of just how sensitive the value of a diamond is to each characteristic, here are some examples (assuming all other characteristics remain constant):

Carat: a difference of 0.1 of a carat (or 0.02 grams) can affect the value of a diamond by as much as 70%.

Colour: a diamond’s colour ranges from D to Z. However the “white” colour range is from D to I (D, E, F, G, H, I). The difference between each colour is very subtle; however a D colour diamond is around 200% more valuable than an I colour diamond. The difference between a D colour diamond and an E colour diamond(which is almost impossible to tell without a set of diamond master stones) can be as much as 40%.

Clarity: even something as small as a pinpoint, which is only visible under a powerful microscope, can affect a diamond’s value. Each pinpoint could reduce the value of a diamond by 40%.

Cut: Round brilliant cut diamonds are more valuable per carat than other diamond shapes; and, obviously, well-made diamonds are worth more than a poorly made diamonds.

The value of the diamond represents between 80 and 95% of the value of a typical diamond ring. Therefore, it is easy to understand why the accuracy of the diamond grading report is so vital.

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