It happened on Saturday just before 2 p.m. on 67th Street and 8th Avenue in Bay Ridge.
The 84-year-old said she was sitting when the two unidentified suspects grabbed the necklace and fled in an unknown direction.
WATCH | Surveillance video shows the incident unfold:
The woman was not injured.
Anyone with information in regard to the identity of the individual is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
ALSO READ | Organization sounding the alarm on hate with Asian American attacks on the rise
* More Brooklyn news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a News Tip