A security guard posted at the Tanishq jewelry store on Veer Nariman Road,Churchgate,was caught while attempting to flee with a diamond necklace worth around Rs 16 lakh on Sunday. Police said Raju Pandit,of Darbhanga,Bihar,was hired by Unique Security Services in Ghatkopar West and had been working at the showroom for the past year-and-a-half. He allegedly stole the necklace placed on the stores display window and concealed it. He was spotted by staff members and handed over to the police. He has been charged under IPC Section 381 (stealing property in possession of a master), said Ravindra Shisve,DCP,Zone 1.