Signet Jewelers, the company behind Kay Jewelers, Jared and Zales, is reporting weak holiday sales figures. Click the audio player above to hear the full story.

Which means 2016 might be a good time to go diamond hunting.

"Freakonomics" author Stephen Dubner explains what keeps diamonds valuable.

Sotheby’s Hong Kong is auctioning the world’s largest round blue diamond, the Premier Blue, for $19 million dollars. There’s not much you can do with diamonds but they are always in demand.

Today, Christie's will auction off a rare 101 carat diamond that is expected to fetch $20 million to $30 million.