Blue Nile helps tech-savvy Marc Antonys bejewel their Cleopatras. The leader in online jewelry sales through its bluenile.com, the company offers luxury-grade jewelry, loose diamonds, settings, and engagement rings, as well as non-bridal jewelry made of gold, platinum, and silver set with diamonds, pearls, emeralds, rubies, and sapphires. While engagement rings account for about 70% of its sales, the e-tailer also sells watches and provides custom jewelry design services. Blue Nile's web sites serve customers in the US, Canada, Europe, and the Asia-Pacific region -- more than 40 countries in all. Chairman Mark Vadon and Ben Elowitz, formerly of Fatbrain.com, founded the site in 1999. In 2016 Bain Capital Private Equity and Bow Street LLC agreed to acquire Blue Nile for $500 million.