Mark Zuckerberg is a certified watch guy. Here are some of his standout timepieces, from a $120 Casio to a $900,000 Greubel Forse.

Anant Ambani seemingly sparked Mark Zuckerberg's interest in watches.

While attending Ambani's pre-wedding party in March 2024, Zuckerberg and his wife, Priscilla Chan, were seen admiring a Richard Mille watch worn by the Reliance Industries heir.

"You know, I never really wanted to get a watch, but after seeing that, I was like, watches are cool," Zuckerberg is heard saying in a video of the interaction.

While he clarified to Chan that he wasn't interested in buying the same watch, he said he'd consider similar options.

Six months later, he was seen wearing a coveted Patek Philippe design.

On September 1, 2024, Zuckerberg shared an Instagram photo of himself embracing his wife. In the image, his wrist was adorned with a large watch featuring a gold face and a brown strap.

Zuckerberg indulged watch fanatics who asked for details, sharing that the watch was a "5236P," or a Grand Complications In-Line Perpetual Calendar watch from Patek Philippe.

The timepiece is crafted with a platinum case and an alligator-leather band. In terms of functionality, it displays the current day, date, and month. It also indicates leap years, moon phases, and whether it's day or nighttime.

It retails for $141,400, according to the brand's website.

He then displayed a rare watch he'd acquired from De Bethune.

Zuckerberg appeared at an "Acquired" podcast event on September 10, 2024. While onstage, he was photographed wearing another flashy watch: a DB25 Starry Varius from the Swiss watch brand De Bethune.

He seemed to be wearing its rose-gold model, which can cost over $80,000 from independent watch sellers. As watch specialist Bryan Li previously told Business Insider, only 20 of the watches are made annually.

Other variants — like one made from titanium and another encrusted with 273 diamonds — can cost between $75,000 and $127,000.

There's also the Aérolite version of the watch, which features a dial made from a meteorite and usually costs $260,000.

This De Bethune piece — and Zuckerberg's Patek Philippe watch — showed a significant shift in the Facebook founder's style, taking his outfits from basic to luxe almost overnight.

Zuckerberg also began wearing an F.P. Journe design in September 2024.

He was photographed wearing a chunky silver watch onstage at the 2024 Meta Connect conference. It appears to have been a variant of a watch from the Swiss brand F.P. Journe's Souveraine collection.

The specific one Zuckerberg wore featured a thick band and large black buttons on its side. Sotheby's listed what appears to be the same watch for auction in March, and said it was made entirely from aluminum.

The auction company also said the watch style was produced between 2011 and 2014. The piece was estimated to sell for between $30,000 and $54,000, though it's unclear what it actually sold for.

The same watch in a darker gray colorway is now available to purchase online for $135,000.

At the beginning of 2025, the tech mogul debuted what appears to be one of the most expensive watches in his collection.

On January 8, Zuckerberg posted a video to announce the end of Meta's fact-checking partnerships in the US. In the clip, he's seen wearing a Greubel Forsey watch that retails for over $900,000.

According to the brand's website, the watch is assembled entirely by hand, and only two or three are crafted each year. It's made with white gold and contains 281 pieces.

Michel Nydegger, the CEO of Greubel Forsey, told Bloomberg at the time that Zuckerberg showed "true appreciation for the most traditional approach to fine watchmaking" by wearing the piece.

He then sported a Rolex at a UFC event in March.

Zuckerberg posted a handful of photos and videos from the mixed martial arts event, which showed a thick gold watch on his wrist.

BI spoke with four watch experts at the time, who all said the timepiece was likely a yellow-gold Rolex Daytona Le Mans.

Though Rolex has never confirmed how many exist, collectors and sellers say the watch style is rare.

That's partially why it had a resale value of up to $300,000, as Ng Yong Shen, a vice president at the Dubai-based secondhand retailer Re-Loved Luxury, told BI.

His watch collection isn't entirely luxurious.

In April, Zuckerberg appeared on The Colin and Samir Show wearing a white timepiece with a vibrant blue face.

Watch fanatics quickly pointed it out as the GA2100WS-7A from Casio's G-Shock line. Made from resin and mineral glass, the watch retails for $120.

So far, it's the least expensive watch Zuckerberg has worn in public.