At about 1:30 p.m. Friday, the victim was approached by two suspects on the 1200 block of Sycamore Drive.
The suspects asked the victim for help cashing what they claimed was a winning lottery ticket.
When the victim entered the suspects' vehicle, the suspects drove to a nearby parking lot and requested that she give them some good faith money for the winning ticket. They said they would give her the ticket so she can cash it in.
When the victim told them she didn't have the money, the suspects threatened her with a handgun and demanded her jewelry. She gave the suspects what they wanted, left the car uninjured and notified police.
The suspects were described as one female and one adult male Hispanic. Officials said both suspects spoke to the victim in Spanish. The suspects' vehicle was described as a gray or silver van, possibly a Chrysler.
The Simi Valley Police Department's Detective Unit was investigating this case.