Blue Nile, Bidz and Tiffany are the top three U.S. online jewelers, according to Internet Retailer magazine's Top 100 Online Retailers, with Blue Nile selling a third (32.57%) of the U.S.’s total online jewelry trade in 2006.

The top three players represent 65.2 percent of all online retail sales, with an estimated cumulative total of $503.6 billion.

Internet Retailer’s full list of top 500 online retailers includes ten jewelry companies, including Ross-Simons, Jewelry Television and Ice, whose total online sales in 2006 were $772.44 million, according to the list.