The incident took place in the wee hours at a jwellery shop located under the Saria police station area, they said.
As per preliminary investigations, a group of 6-7 masked thieves entered the shop after opening its shutter with the help of a rod.
They ransacked glass counters and took out the ornaments, but could not break the lockers, he said.
The thieves fled with gold and silver ornaments collectively worth Rs 25 lakh, a police official said.
A case has been registered on a complaint of the shop owner, Sanjay Agrawal, the official added.