How to Buy a One Carat DiamondLet’s get the basics out of the way. There are two things you need to decide on your own: which shape diamond you want and what style setting you will put it in. Those decisions are based on personal preferences and style. Once you figure those two things out, it’s time to pick out a diamond. We’ll give you a quick crash course, but make sure to look up all relevant videos and articles we have for the specific diamond shape you are getting.