Model Mia Sand spotted wearing a Rolex

Mia Sand, the Danish fitness model and social media personality known for her striking physique and lifestyle content, was recently spotted on the wrist with a Rolex Sea-Dweller reference 126603 — the two-tone variant pairing 18-carat yellow gold with Oystersteel and finished with a crisp black dial. It is a watch that balances hard technical credentials with a level of visual warmth rarely found in dive watches at this depth rating.

The Sea-Dweller lineage traces back to 1967, developed in direct collaboration with professional saturation divers from the COMEX and US Navy diving programs. The original brief was clear: build a watch capable of surviving extreme depth and the decompression chamber conditions that followed. The helium escape valve — a one-way port on the case side — became the Sea-Dweller's defining technical feature, allowing helium atoms that permeate the watch during extended saturation dives to exit safely during decompression without blowing the crystal off. The ref. 126603 launched in 2018 and carries that same valve, rated to 1,220 metres (4,000 feet), housed in a 43mm case that splits the difference between the standard 40mm Sea-Dweller and the larger 44mm Deepsea.

Specifically, the 126603 runs on the Rolex Calibre 3235 — an in-house movement featuring the Chronergy escapement, a paramagnetic nickel-phosphorus lever and escape wheel, and a 70-hour power reserve. The black dial is clean and highly legible, with chromalight luminous plots. The two-tone Cerachrom bezel in black ceramic carries gold-filled graduated minute markings on its unidirectional rotating 60-minute scale, an arrangement that allows divers to track bottom time with a single pre-dive bezel rotation.

Among collectors, the ref. 126603 occupies a specific niche. Purists who prefer the utilitarian all-steel Sea-Dweller sometimes overlook it, but the two-tone execution has attracted a growing audience that appreciates the 18-carat gold crown guards and bracelet centre links as a statement of intention rather than mere decoration. Supply has historically been tighter than the steel-only references, which sustains demand on the secondary market.

For Mia Sand, whose brand is built on discipline and physical confidence, the Sea-Dweller ref. 126603 reads as a natural fit — a watch with genuine technical authority that happens to carry considerable wrist presence. At approximately $22,250 retail, with grey-market values running meaningfully above list, it is not an entry-level choice.