For some brides, the size of the rock is more important than the quality of its color or overall sparkle factor. If size is the most vital consideration, grooms should consult with a reputable jeweler to find a diamond high in carat size.
A quick crash course in the 4 Cs will help you understand diamond lingo. Diamonds are graded for quality on a scale of how their carat, clarity, cut and color measure up. Carat actually refers to the diamond's weight, not its size. Clarity is determined by the number of flaws (inclusions) in the diamond. The diamond's cut refers to how beautifully it sparkles, which is dependent on how expertly it was cut from the rough diamond. Cut is graded on a scale ranging from poor to ideal. The final "C" stands for color. Ideally, all diamonds would be clear/colorless, but they often have slight tinges of yellow or white.
All diamonds have some naturally occurring inclusions, but many flaws are invisible to the untrained eye. It's hard to find a diamond that's colorless and that's been cut perfectly -- and if you do, you'll pay handsomely for it. Remember this when choosing a stone for a bride who likes big rocks.