On the morning of Monday, February 17, 2003, a security guard descended into the vault of the Antwerp Diamond Center and found the floor littered with paper, torn envelopes, and cracked-open deposit boxes — 109 of them, out of 189, pried apart like tin cans. The vault sat two floors beneath street level in the heart of Antwerp’s diamond district, protected by ten layers of security including infrared beams, a Doppler radar motion sensor, a magnetic field alarm, seismic sensors tuned to detect drilling, and a combination lock with 100 million possible codes. Diamond dealers who rented boxes there had been told, repeatedly, that the vault was impenetrable. Over that single weekend, a small crew of Italian thieves proved otherwise, walking away with diamonds, gold, and jewelry that appraisers would eventually value at somewhere between $100 million and $500 million — the largest diamond heist ever recorded and one of the biggest robberies in history.

The Man Who Rented a Desk

The operation’s mastermind was Leonardo Notarbartolo, a Turin-born career thief who had spent nearly three years quietly embedding himself inside the Antwerp Diamond Center. Posing as an Italian diamond merchant, Notarbartolo rented a small office in the building, giving him a legitimate reason to come and go, to walk the halls, to watch guards change shifts, and — critically — to be issued access to the vault level itself. He assembled a crew nicknamed the “School of Turin,” a loose network of veteran Italian burglars with decades of combined experience, and over roughly two and a half years they studied every inch of the security system, reportedly using a small camera hidden in a smoke detector to record the vault manager entering the combination.

Hairspray Against a Fortune in Sensors

The heist’s most celebrated detail is almost absurdly domestic: to defeat the heat-and-motion sensor guarding the vault, the crew coated it in a fine mist of ordinary women’s hairspray. The sensor was designed to trigger only when it detected both a heat signature and movement simultaneously; the hairspray’s oily residue insulated the sensor just enough to blunt its readings without triggering an obvious fault. The vault’s magnetic field alarm, meanwhile, was defeated over multiple visits: the crew located the screws securing the magnetic contact plates, loosened them while the system was briefly disarmed for other reasons, and fitted a thin aluminum plate to preserve the magnetic connection artificially so the door could later be opened without breaking the circuit. A separate light sensor on the vault’s power system was disabled with ordinary tape, letting the thieves switch on the lights and work in comfort rather than fumbling in the dark. They picked the lock’s mechanical tumblers rather than trying to crack the 100-million-combination dial, and by the time they left, they had opened 109 boxes using a crowbar in a matter of hours over the long weekend.

Undone by a Sandwich and a Ditch

For a plan built on years of patient precision, the unraveling was almost comically fast. Fleeing the scene, an accomplice was tasked with disposing of evidence — bags of paperwork, cut-open deposit boxes, and personal items from the heist — by dumping them along the E19 motorway between Antwerp and Brussels. A local landowner found the debris the next morning and alerted police. Sifting through the trash, forensic investigators recovered a half-eaten salami sandwich and discarded paperwork, including a discarded receipt, that carried traceable DNA and documentation linking directly back to Notarbartolo. He was arrested within days, on February 21, foolishly returning to the Diamond Center under the belief that acting normally would deflect suspicion. Belgian police, tipped further by surveillance footage and phone records, rounded up several accomplices in the following months, though key figures were never definitively identified and much of the loot was never recovered.

A Sentence, a Denial, and a Confession Decades Later

Notarbartolo was convicted in 2005 and sentenced to ten years in prison by an Antwerp appeals court, though he always maintained in public that he was merely a fall guy for a robbery orchestrated by unnamed figures inside the diamond trade itself — a claim widely doubted by investigators. He was paroled in 2009, only to violate his parole conditions by failing to compensate victims, resulting in a European arrest warrant, his re-arrest at Paris’s Charles de Gaulle Airport in 2013, and a return to prison to serve out his term until 2017. In the years since his release, Notarbartolo has become an unlikely public figure around his own crime: in 2023 he published a memoir, “Rubare l’impossibile” (“Stealing the Impossible”), and in August 2025 he appeared on camera for the Netflix documentary “Stolen: Heist of the Century,” offering his most detailed account yet of the planning, the hairspray, and the disastrous drive down the E19. Despite the confessions and the media attention, the overwhelming majority of the stolen diamonds and gold — estimated by some insurers at well over $100 million in value — has never been recovered or definitively traced.

Why This Case Still Matters

The Antwerp heist endures as the definitive lesson in the limits of technological security: a vault wrapped in radar, infrared, seismic sensors, and magnetic fields was ultimately beaten not by hacking or explosives but by patience, cheap hardware-store tools, and the simple fact that any system built and maintained by humans inherits human routines that can be studied and exploited. It reshaped how the global diamond trade — centered overwhelmingly in Antwerp, which handles a huge share of the world’s rough diamond trade — thinks about physical security, insurance requirements, and vetting of tenants inside supposedly secure buildings. The case has also become a cultural touchstone precisely because of its unglamorous methodology; unlike Hollywood heist fantasies involving lasers and rappelling wires, this was accomplished with items any of us could buy at a drugstore, a detail that makes it simultaneously more absurd and more unsettling.

Leonardo Notarbartolo has told his version of the story in books and documentaries, always insisting he was a scapegoat rather than the true architect — and yet the diamonds themselves, worth what could be well over $100 million by today’s valuations, have never resurfaced in any traceable market. So if the man convicted of masterminding the “heist of the century” says he wasn’t really the one calling the shots, who was — and where, more than two decades on, did a fortune in loose diamonds actually go?