April Birthstone: Diamonds
If you were born in April, then diamonds are your birthstone. Diamonds are one of those stones that people think they understand, but probably know dangerously little about. It is the hardest rock, but you can still damage it. It is valuable, but many stones (depending on cut and colour of course) are more expensive.
I myself am not dripping in diamonds. Pictured here are some of the tiny rocks that I got.