Diamonds are made out of carbon — highly organized carbon, that is. Geologists are still guessing how diamonds formed in the Earth from 1 billion to 3 billion years ago.

Want to learn how to do a DIY ring clean? Here, we ask jewelry pros to give us the inside scoop on how to clean a diamond ring at home.

These are the kinds of numbers, Leah Turner says, that can make you feel intimidated and overwhelmed, even. Depending upon ...