One of the most important considerations when selecting a diamond engagement ring is the size of the stone. For most people, the larger, the better! ... Typically, a smaller diamond will present proportionately better on a smaller sized hand, while a small carat diamond on a larger size hand may appear even smaller.
Does it matter how big your engagement ring is?
Never sacrifice cut for size
So, remember – size matters but cut matters more. However, clarity and color also affect the appearance of the diamond. Price is a combination of all of the 4 Cs, and going higher in one of the Cs might mean going lower in another of the Cs.
Is it better to size up or down engagement ring?
Truthfully, if you're ever unsure of your ring size, it's always wiser to size up. It's much easier to resize a ring that's too big than it is to resize a ring that's too small, provided the ring can be resized at all.