'World's biggest, best diamonds formed deep inside Earth's mantle'
Researchers from the Gemological Institute of America studied the unique properties of diamonds with similar characteristics to famous stones such as the Cullinan, Constellation and Kohinoor by examining their so-called "offcuts," which are the pieces left over after the gem's facets are cut for maximum sparkle.
Dec 16, 2016, 14:22 PM IST