A diamond of 1 carat weighs 0.2 grams. The more a diamond weighs the bigger it is. A bigger diamond is rarer and therefore more expensive.
The most expensive color for a diamond is no color at all. Diamonds exhibit almost all colors, but most frequently shades of yellow and brown
Diamond formation rarely happens under ideal conditions. During their growth sometimes, preexisting minerals such as garnet, olivine or even small diamonds are included in a diamond. Inclusions are diagnostic for a diamond; they are like fingerprints and make it possible to find a particular diamond out of hundreds of diamonds. The less inclusions a diamond has the rarer it is and therefore expensive.
Fashioning of a diamond, today the vast majority of diamonds are finished in round brilliant cut. Other cuts include baguette, carré or emerald cut. Of the 4 C’s, cut is the only quality characteristic that can be influenced by man.