The sleight-of-hand theft occurred on June 20 at a salon in the 12100 block of Ventura Boulevard, and the incident was captured on surveillance video.
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The footage shows a woman discreetly picking up another woman's wedding ring that was left on a side tray. The thief then slips the stolen jewelry into her purse, police said.
Los Angeles police arrested 25-year-old Yuri Cho on suspicion of grand theft on Monday.
Authorities said the ring has been returned to the victim.