Experts estimated the egg's value at about $33 million. The dealer had hoped to make $500.
Wartski acquired the egg for a private collector. The price was never made public.
“It has travelled from Imperial St Petersburg to the rust belt of America,” McCarthy said.
In April 2014, the collector let Wartski show the egg in London for four days. It was only the second time it had been displayed in public. The first had been in St Petersburg, in 1902.