From sparkling multi-million-dollar diamonds to custom designs, here are the most expensive diamond rings in the world that ...

The Graff Pink, a 24.78-carat fancy intense pink ... the Blue Moon of Josephine is a 12.03-carat fancy vivid blue diamond. The buyer, billionaire Joseph Lau, named the gem after his daughter ...

She has been working in journalism for seven years. Experts call it "the most vivid pink diamond" ever put for sale — and it's expected to fetch a pretty penny at auction later this year.