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

Also, check out the most expensive pieces of jewelry. Earning passive ... Weighing in at 14.62 carats, the Oppenheimer Blue is the largest vivid blue diamond ever sold at auction.

With historic roots and a royal Indian legacy, the 23 carat Golconda Blue diamond is the largest fancy blue diamond ever put up for auction.