Dont be fooled into buying diamond stud that is said to be .25 points. It is NOT a quarter of a carat, and will be so small that it should only be used as accent to other stone or the gold itself.
Most GIA Certified Diamonds are over three billion years old, two-thirds the age of the Earth. There are a few "youngsters", though, which are only 100 million years old.
wholesale diamonds measured by carat weight. Normally, people want the biggest anniversary rings they can get. But technically, bigger sized anniversary rings usually suffer in quality, such as a loss in brilliance.