SHAPEShape refers to the overall form and appearance of the stone; such as round, square etc. The shape and cut quality are sometimes confused. Most popular shapes are round, rectangular or square, oval and other fancy shapes. We have included shape in the 10Cs as shape influences price of a diamond. When diamonds are cut and polished from rough they lose up to half of their weight and this loss determines the price. Round brilliant cut is more expensive than princess or pear shape diamond as during cutting process we lose around half of rough diamond's weight.
All shapes other than round brilliant cut diamond shape are called fancy shapes. Different shapes have varied ability to reflect light and the same criteria can have different impact on overall look of a diamond in depending their shape. Unique criteria determine quality for each shape.