Police have released surveillance video of the man they want to find.
He's accused of following a woman into a building on Saint John's Place in the Crown Heights section Friday night.
Police say he followed her into the elevator before pushing her to the ground, kicking and punching her, and taking off with her jewelry.
The suspect removed her rings, chains and pendants and fled the scene.
He is described as a black male, 5'9" tall weighing 185 pounds wearing blue jeans and a grey sweatshirt.
Anyone with information is asked to call the NYPD's Crime Stoppers Hotline at 800-577-TIPS.
The public can also submit their tips by logging onto the Crime Stoppers Website at http://WWW.NYPDCRIMESTOPPERS.COM or texting their tips to 274637(CRIMES) then enter TIP577.