The 4 C's are decisive criteria for the value assessment of a diamond:
Carat (weight), Color, Clarity and Cut of a diamond determine its value. The heavier, whiter and purer a diamond is and the more perfect its cut, the more valuable it is.
1 Carat = 0,20 g
The weight of a diamond can be estimated relatively easily by measuring its diameter:
4,10 mm = approx. 0,25 ct.
5,20 mm = approx. 0,50 ct.
5,90 mm = approx. 0,75 ct.
6,50 mm = approx. 1,00 ct.
The colour of a diamond is divided into 6 groups:
The clarity of a diamond/brilliant is determined by the type and amount of natural inclusions. The following international grading scale is used:
The cut is another important criterion for brilliance and fire of a diamond/brilliant. The better the cut, the better are fire and brilliance of the diamond. The quality of the cut is referred to as:
In our price lists you can find the diamonds/brilliants with the properties that are the most common on the market.
Upon request we can provide you with information on the price of diamonds/brilliants with different properties.
At InLumen all diamonds/brilliants are certified. The certificate is the ID of a diamond. It contains all important properties to be able to identify the diamond beyond doubt.
The certificates are issued by renowned international and national laboratories such as GIA, IGI, HRD, DPL or DGPL and are delivered together with the piece of jewellery.