The Diamond 'Carat - Weight' specifically refers to the weight of a diamond. However to understand how a diamond’s carat weight corresponds with its size, we recommend
that you consider a stone’s carat weight in conjunction with two other factors – the dimensions of the top (crown) and its quality of cut.
The first one deals
with the millimeter dimensions of the top of the diamond. This is a significant factor to think about because a diamond, when set into a ring, is always viewed from its top.
second one to note is the cut of the diamond.