Let's start with cut, becasue it is the most obvious of the criteria with regards to diamond engagement rings. Each diamond is different, and part of the gem cutters job would be to design the facets from the gem such that they're going to unlock as much radiance and fire inside gem as you possibly can. It describes how deep, or how shallow, the facets are cut, and also the general design from the final cut, including princess, marquis, heart shaped, square cut, and others. Carat may be the determination with the diamonds overall weight and mass, and the gem cutters focus on keeping the maximum amount of from the original size as is possible since they sculpt the ultimate diamond. []