A 7.03-carat fancy deep blue diamond mounted on a platinum ring by London high jewelry house, Moussaieff, is the top lot at Christie’s Geneva Magnificent Jewels sale. The blue rectangular-cut ...

The fancy grade vivid blue rectangular-cut stone of 14.62 carats was named for Sir Philip Oppenheimer, member of a family that owns the De Beers mines, and mounted by the prestige jeweler Verdura.

"Exceptional" blue diamond set to fetch £32 million at auction ... Sir Philip, who ran De Beers, could have had any diamond he wanted, but he chose this enormous rectangular gem, ...