Are you getting engaged this Christmas? You do know there are only 16 days left, right? Maybe Valentine's Day is better. Buying an engagement ring is no easy process. You have to decide how much you want to spend, the design, the metal, the carat weight etc. A one carat round solitaire diamond is the size most women dream of getting for an engagement ring. Maybe when you got engaged you could only afford a smaller carat weight, and now you want to upgrade her ring. This is a lovely choice, in my opinion.