What it actually is
Most "meteorite dials" come from iron meteorites, which are fragments of the metallic cores of long-shattered asteroids. The two big sources are Gibeon (Namibia, fell ~30,000 years ago) and Muonionalusta (Sweden, fell ~1 million years ago). A small slice is cut, polished flat, then chemically etched with weak nitric acid. The acid eats away the more reactive nickel-poor bands, leaving raised nickel-rich bands and revealing the Widmanstätten pattern: a crisscrossing geometric lattice of crystals first identified in 1808.
Why the pattern looks the way it does
When the parent asteroid's metallic core cooled in space, it cooled extremely slowly, on the order of 1 °C per million years. At those timescales, the iron-nickel alloy had time to separate into two distinct crystal phases: kamacite (low nickel, ~5%) and taenite (high nickel, ~30%). They form interlocking plates oriented along the parent crystal's octahedral planes. You cannot reproduce this pattern on Earth; we cannot cool metal slowly enough. The pattern is the only way to authenticate an iron meteorite, and it is unique to every fall.
Who uses meteorite dials
Rolex has used meteorite dials on the Day-Date and a famous run of Daytonas (the Daytona meteorite gold variants are some of the most collectable modern Rolexes). Omega uses them on the Speedmaster Grey Side of the Moon and Constellation lines. Jaeger-LeCoultre on certain Master Grand Tradition pieces. De Bethune's DB28 Kind of Magic and Parmigiani Tonda Hijri Perpetual are both meteorite-faced. The dial is most common on cosmic / astronomical complications (perpetual calendar, moonphase, time-zone) where the spacefaring metal is symbolically apt.
What it costs and why
A meteorite dial typically adds CHF 1,000 to CHF 5,000 over the equivalent metal dial, sometimes more. The base material is not particularly expensive (iron meteorite slabs sell for a few hundred euros wholesale), but processing is. Each slice must be cut, polished, etched, treated against rust, and then drilled and printed without breaking. Yield is poor; many slices crack or have cosmetic flaws and are rejected. Every dial looks slightly different, and brands cannot guarantee a specific pattern, only the family aesthetic, which is part of the appeal.
Will it rust?
Yes, easily. Iron-nickel meteorite is highly susceptible to corrosion from atmospheric humidity, fingerprints, sweat, and salt. Brands stabilise meteorite dials by applying clear lacquer, by passivating the surface with chemical treatments, or by storing them in inert atmospheres before final assembly. After casing, the dial is sealed inside the watch and is normally fine for decades, but if the case seals fail and water gets in, a meteorite dial can develop visible rust spots that are not repairable beyond replacing the dial. Treat a meteorite-dial watch as you would any precious finish: avoid prolonged humidity, get gaskets serviced, and do not open the caseback yourself.
Should you buy one?
The dial is genuinely beautiful, genuinely unique per piece, and the story is unbeatable. The trade-offs: cost, slightly more legibility issues than a printed dial (the Widmanstätten lattice can compete with the hands at certain angles), and the fragility above. If you want a one-of-one quality piece, a meteorite dial delivers that. If you want a daily wearer where you do not have to think about the dial, pick a sunburst or matte version. See also: guilloché, another way to add unrepeatable surface texture to a dial.