"They'll come up to them, engage them in a convo that's very friendly and take cheap costume jewelry or a bracelet/necklace and say 'we want you to have this,'" says Capitan Denton Carlson with the San Ramon Police Department.
It's the same "slight of hand" crime targeting seniors in many parts of the Bay Area, Southern California and Sacramento area.
Video from a man named Chris Luu shows his 82-year-old mother in the front yard of her San Jose home. She's flagged over by a woman in an SUV who says some words to her, gets close and suddenly her gold chain is gone. Video shows the woman walk away, slightly confused at what just happened.
If you're on the ABC7 News app, click here to watch live
Capitan Carlson explains the crime.
"They'll slip the jewelry on the unsuspecting victim and at the same time they're engaging, they'll take it back and remove the victim's valuable jewelry."
This type of crime is not new, but San Ramon police say it targets the elderly, who need to be especially diligent during the time of the Lunar New Year.
"This is a part of a large group, stemming from the Eastern European area. In our city, the target demographic were the elderly and it was people of South Asian descent."
Dozens of primarily Asian Americans, reached out to ABC7 News on social media, warning their loved ones had been victimized as well. Reports came in from Union City, South San Francisco, San Francisco and other parts of the Bay Area.
Very few reported their crimes to police.
EXCLUSIVE: Senior couple's life savings stolen in brazen burglary caught on camera in SF
Cherry Vu and her brother say their 59-year-old disabled mother was targeted outside an Asian supermarket in San Jose.
"They noticed she was wearing a big chain gold necklace," says Cherry.
Her brother says, "Mom came close, put this jewelry in my mom's hand, came over and took the necklace off."
Her necklace was worth about $5,000 to $6,000.
San Jose police also had a recent case involving a 90-year-old non-Asian woman who had $40,000 in jewelry taken from her.
San Ramon police were able to make arrests in connection to 10 reported cases, but believe there are many more victims. They, and Cherry urge families to come forward, in order to fight this growing crime trend.
EXCLUSIVE: Men with luxury watches, including a $30,000 Rolex, targeted in Bay Area robberies
"I was so angry," says Cherry. "We really need to get the news out there, not only for our Asian community but our elders."
San Ramon police say the two people they arrested for these crimes were from Orange County and were caught with the public's help reporting their crimes.