THE 4Cs OF MOISSANITE
Just like diamonds, there are four Cs jewelers use when grading moissanite. And they tell customers everything they need to know. In order to fit available settings, it's often easier for jewelers to order moissanite by millimeter. The specific gravity of moissanite is 3.21 grams per cubic centimeter, so a 6.5 mm round brilliant moissanite jewel is approximately 0.87 carats.
THE 4Cs OF DIAMONDS
Diamond Color, Clarity, Cut and Carat Weight are collectively termed the 4Cs – the factors that, when combined, define a diamond’s quality and ultimately determine its value. GIA created the 4Cs of Diamond Quality, which has become the universal method for assessing the quality of any diamond, anywhere in the world. The creation of the 4Cs means that diamond quality can be communicated in a universal language so diamond purchasers know exactly what they are buying.