diamond fashion which have no apparent colour are termed colourless. The colourless loose diamond transforms the light which enters them and acts as a prism, dividing light into a rainbow of colours known as the ‘fire’ of the diamond.
The most popular antique engagement ring shape has been the round brilliant because people believed it to be an "ideal cut" that displayed the most brilliance and sparkle in a loose diamond.
The first step in manufacturing Tiffany Style Diamonds is to give them to a cleaver or sawyer. They both, essentially, perform the same task: That is to cut--or cleave--the loose diamond in two pieces in order to bring out the best profile that will determine the end product of the stones.