Designed to sparkle for a lifetime, this diamond double halo necklace from the leo diamond® collection is made for her. 14k white gold a 1/2-carat round-cut diamond is wrapped in a double halo of round-cut diamonds total diamond weight is 1 carat 19-inch cable chain with lobster clasp the leo® diamond is the first diamond independently certified to be visibly brighter patented technology strategically places additional facets onto the diamond, maximizing the return of light and creating faraway sparkle