Two tourists allegedly pulled off an elaborate diamond swap at a jewelry store in Singapore, but their escape lasted only a few hours. Police arrested them at Changi Airport before they could leave the country.

Tourists Arrested At Singapore Changi Airport After Elaborate $154,000 Diamond Theft

A carefully planned diamond heist in Singapore came apart at Changi Airport, where two foreign tourists were arrested while attempting to fly home with the stolen stone.

The men, Mangroliya Manojkumar Kurjibhai, 41, and Serasiya Milan Ramnikbhai, 30, allegedly traveled to Singapore with a counterfeit diamond manufactured to match a genuine 4.95-carat stone, right down to its specifications and serial number.

(hardly an impulsive shoplifting attempt…)

Before arriving in Singapore, the men had apparently identified the diamond they wanted from Dianoche, a jewelry store on Kreta Ayer Road in Chinatown, and commissioned the replica in India. Court documents do not explain how they obtained such precise details about the genuine stone.

Fake Diamond Hidden In Mouth, Real Diamond Swallowed Up In The Scheme

The pair arrived in Singapore on June 19, 2026, and entered the jewelry store at around 3:00 pm.

According to prosecutors, Serasiya entered with the counterfeit diamond hidden in his mouth. Mangroliya then asked a sales manager to show him the genuine diamond, valued at US$154,000, or approximately S$199,000.

Mangroliya reportedly kept the manager occupied by asking to view other pieces, causing him to leave his seat several times.

At the right moment, Mangroliya instructed his partner to make the switch. Serasiya allegedly spat the fake stone out of his mouth, replaced the genuine diamond with it, and then concealed the real diamond in his mouth.

The pair told the manager they would think about the purchase and walked out.

That might sound like a clever plan, but the entire exchange was captured on the store’s CCTV system. The sales manager then examined the returned stone using an optical gemstone identification machine and quickly determined that it was counterfeit.

You’d think there would be panic at that point (and I’m sure there was some), but this was Singapore after all.

Arrested At Changi Airport Hours Later

After leaving the store, the men checked out of their hotel and booked tickets back to India.

They made it as far as Changi Airport Terminal 3.

At approximately 9:00 pm, only six hours after entering the jewelry store, both men were arrested while attempting to clear immigration. Police recovered the genuine diamond from Serasiya’s backpack. Singapore police reportedly identified the men through CCTV footage from the country’s extensive network of police cameras.

Imagine spending the time and money to commission a counterfeit diamond with a matching serial number, fly internationally to execute the swap, and then apparently assume you could stroll through one of the world’s most heavily monitored airports a few hours later…idiots.

Singapore is not the place to test whether security cameras are working.

Mangroliya pleaded guilty to theft and was sentenced on July 17 to two years, two months, and two weeks in jail. Serasiya’s case remains pending. Theft in Singapore can carry a sentence of up to seven years in prison and a fine. I’d call for caning, but maybe Iranian-style punishment would better fit the crime?

Crime Does Not Pay In Singapore

I have to give them credit for creativity. Hiding a counterfeit diamond in your mouth and swapping it for the genuine article sounds like a Hollywood movie. But the theft itself was far more sophisticated than the escape.

Singapore is orderly and safe in no small part because it takes crime seriously and backs that up with extensive surveillance, competent policing, and serious consequences. You may dislike aspects of that system, but the deterrent effect is difficult to deny…I respect it.

The suspects did not disappear into the city or make it across the border. They were identified, tracked to Changi Airport, stopped before departure, and the diamond was recovered, all within a matter of hours.

One man is now serving more than two years in a Singapore prison, while the other will likely soon join him. All for a diamond they never even managed to remove from the country…

CONCLUSION

Two tourists allegedly executed an impressively detailed diamond swap at a Singapore jewelry store using a counterfeit stone hidden inside one man’s mouth. But their getaway plan ended at Changi Airport, where police arrested them before they could board their flight to India and recovered the stolen US$154,000 diamond.

The lesson could not be clearer: crime does not pay in Singapore.

Image: Singapore Police // Hat Tip: SINJim