It happened around 11:45 a.m. on New Year's Eve at the Borough Hall subway station in Downtown Brooklyn.
Police said the suspect approached the victim on the southbound 2 train and started talking to her. Then he began choking the woman and tried to remove her necklace.
He then fled in an unknown direction.
Police described the suspect as a 35-year-old black man who is 5-foot-8 and weighs 180 pounds. He is bald with brown eyes and was last seen wearing a black jacket, dark-colored shirt, blue jeans, white scarf, yellow boots and dark-colored glasses.
Anyone with information in regards to the above incident is asked to call Crime Stoppers at 1-800-577-TIPS (8477). The public can also submit tips by logging onto the Crime Stoppers website at WWW.NYPDCRIMESTOPPERS.COM or by texting their tips to 274637 (CRIMES) then enter TIP577.
----------
* More Brooklyn news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube