The incident happened yesterday evening at the Karol Bagh metro station when CISF constable Shashikant noticed an unattended bag at the X-ray baggage screening machine.
The troopper immediately alerted his seniors and on verification, it was found that the bag contained diamond rings, gold necklaces, ear rings and other jewellery.
On further checking, it was found that the bag contained identification of Gopal Babu, a resident of Tilak Nagar in the national capital.
Earlier this month, a CISF jawan had helped a Metro commuter recover his bag containing Rs 1 lakh cash, which he had forgotten at Chawri Bazar Metro station.
The Central Industrial Security Force guards all the stations of the Delhi Metro in the national capital region.