An elderly woman had an Indian gold necklace pulled from her neck while cleaning her car in Holme Slack Lane, Preston.
Police said the woman was very distressed by the incident which occurred at 9.15pm on Monday, July 21.
Two males, aged between 17 and 20 are wanted in connection with the robbery. One was wearing all black with his hood up, and the other, was around 5ft 5, slim, with dark shaved hair.
Call the police on 101 quoting LC-2014-0721-1566.