An introduction to diamonds
The cut is the most important characteristic of a diamond. When you see diamonds selling for prices that are too good to be true, it is usually because they are cut poorly.
Diamonds boast an entire range of colors, from faint yellow or brown to rare pinks, blues and even greens. The best color for a diamond is a lack of color. It is the totally colorless diamond that allows white light to pass through it effortlessly, dispersed as rainbows of color.
Almost all diamonds have imperfections (jewelers call them inclusions). Clarity measures how many, or how few, of these inclusions occur within a diamond. The scale ranges from FL (flawless) to I3 (having many imperfections that are easily visible to the naked eye).
About the weighing and measuring of diamonds.
A certified diamond is a diamond that comes with documentation from an independent testing laboratory. The certificate gives measurements for the diamond, as well as diamond grades for each key characteristic. In addition, the certificate gives a detailed diagram of the diamondís inclusions. (This will allow you to verify that the diamond you are holding matches the certificate).
The first thing to decide when purchasing a diamond is the shape of the stone. There are nine major shapes of cut diamonds.