Two thieves sneaked into a Southampton house and stole a safe with $400,000 worth of jewelry inside, Suffolk County Police said Wednesday.

The burglars, wearing all black, struck at about 9:45 p.m. on Aug. 10, cops said.

They got into the Halsey Neck Lane home through an unlocked kitchen door, authorities said.

Once inside, they grabbed a safe loaded with jewelry, including a Rolex watch and diamond earrings, Suffolk County Police said.

The suspects are still at large.

Suffolk County Crime Stoppers are offering a reward of up to $5,000 for information leading to the arrest and conviction of the thieves, police said.

Surveillance video from the scene of the crime shows the two burglars sneaking through the extravagantly decorated house.

The video then cuts to the driveway outside the house and shows one of the thieves lugging the safe down the pavement.

Images of some of the items that were stolen show a gold Rolex watch with the words “Oyster Perpetual” encrusted on the face of the timepiece.

The Rolex can fetch thousands of dollars online.