The carat weight of a diamond is perhaps the most obvious factor in determining its value. The weight of a diamond is measured in carats. One carat equals 0.2 grams and there are 100 points to a carat. Thus a 50-point diamond is half a carat (0.50ct) and weighs 0.1 gram. It's important to keep in mind that two diamonds of equal carat weight can vary greatly in worth. In fact, a smaller diamond may actually be more valuable than one with a greater carat weight if its cut, color and clarity are superior to that of the larger diamond. That's where the highly educated experts at Josephs can help. If it's a Josephs Diamond, you can be certain it measures up.