Video shows three men with guns robbing the 26-year-old victim.
It happened just after midnight on Sunday at Jordan MVP Barbershop in Washington Heights.
The suspects took off with $150,000 worth of jewelry.
No one was hurt.
Police are asking for the public’s help tracking down those responsible.
Call the NYPD’s Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). You can also submit tips by visiting the CrimeStoppers website at crimestoppers.nypdonline.org or by messaging on Twitter @NYPDTips.
Ex-Brit turned Manhattan resident since 2008.