Model: Rolex Cosmograph Daytona

Bezel: Rainbow gradient set with baguette-cut colored gemstones (sapphires) transitioning around the spectrum.

Dial: Black dial with diamond hour markers, three gold-crystal chronograph sub-dials, and red accents.

Case & Lugs: Gem-set case with brilliant-cut diamonds set into the lugs and crown guards.

Bracelet: Oyster bracelet with a three-piece solid link design.

Note: Given details in printing quality, sub-dial text alignment, and finish, this particular piece appears to be an aftermarket custom modification or a replica inspired by the authentic Rolex Rainbow Daytona.