The shape of stones: The secret of a good size (cut - 4C) lies in the symmetry, the balance of the proportions and the talent of the diamond cutter.
The shape of the stone (round, oval, square, ...) is to be considered at the same time than the type of faceting:
Brilliant cut: crown and breech cut in triangle and kite. The lower part of the stone goes to a central point (culet)
Step cut: parallel facets (ex: emerald cut)
Mixed cut: upper part brilliant and lower part in degrees (ex: princess size) or conversely
Cabochon cut (unusual for diamonds): rounded polished surface, not faceted
Other cut: brilollette, buff top, plate, ....
Taille en degrés
Mixte - Princess
Step cut - Asscher
Step cut - Emerald
Mixte - Radiant