A woman caught on surveillance video allegedly making off with $360,000 worth of jewels from her Manhattan hotel companion last week has been identified by police.

The woman, 34-year-old Erika Cooper of Manhattan, is accused of stealing the gems from a sleeping guest at Cosmopolitan Hotel in Tribeca, with whom she checked in at about 12:30 a.m. last Tuesday, April 17.

The 47-year-old victim, who is a gems trader, told police he'd met the woman earlier that night at the Whiskey Bar at 100 Central Park South. The two went to the Cosmopolitan Hotel together, and he fell asleep after the two had sex, police said.

That's when Cooper allegedly took off with his briefcase full of jewels.

Cooper, who also goes by the name Bianca Williams, is described as about 5 feet 9 and 120 pounds, with brown eyes and black hair.

Anyone with information on Cooper is asked to contact Crime Stoppers at 800-577-TIPS or at nypdcrimestoppers.com.

Get the latest from NBC 4 New York anytime, anywhere. Follow us on Twitter, Facebook and Google+. Get our apps here and sign up for email newsletters here. Get breaking news delivered right to your phone -- just text NYBREAKING to 639710. For more info, text HELP. To end, text STOP. Message and data rates may apply.