This is a Patek Philippe Aquanaut Chronograph, specifically the reference 7968/300R-001, often nicknamed the "Rainbow Aquanaut".
Key Details
• Model Family: Patek Philippe Aquanaut
• Reference: 7968/300R-001
• Material: 18ct rose gold case with a red Aquanaut rubber strap
• Bezel: "Rainbow" bezel set with graduated baguette-cut coloured gemstones
• Dial: White mother-of-pearl dial with the signature Aquanaut embossed pattern
• Functions: Chronograph, hours, minutes, small seconds, and date display
• Movement: Manufacture automatic chronograph movement with approximately 45 hours of power reserve