Now to be forgotten is another vital "C" and that is of course carat. Carat refers to the weight of the stone, and one carat is one fifth of a gram. You don't need me to tell you that a large diamond is more valuable than a small diamond, but it is interesting to know that large diamonds are of course rarer.
Not all diamond cuts look the same size ever if they are the same carat weight, and a brilliant cut is the one that punches above its weight because of its diameter.
Now, For a single-stone ring, I think don't go below 1 carat because you really want to have that wow factor. Carat and size is not everything, so you always have to balance that with the other three.
Graff, who are absolute experts at diamond cutting and polishing, will make the most of every single diamond. So it really is worth going for the best quality of cut