The 4C's
These characteristics do not only determine the stone’s quality, they can also be very useful in identifying the diamond, since every diamond is unique.
Carat Carat refers to the weight of a diamond. Clarity The clarity or purity of a diamond is determined by the number, size, brightness and location of the internal and external characteristics, important structure phenomena and transparency. Colour Over 90% of all gem diamonds have a basically yellowish colour. The intensity can vary from nearly colourless, which is preferable, to decidedly yellow. Cut The proportions and finish grade of a diamond establish the quality of the cut.The quality of a diamond is defined by means of the C’s: Carat, Clarity, Colour and Cut.