The Patek Philippe Reference 7121J is a women's watch with a moon-phase complication and a white gold case. The watch features a blue dial with gold applied Breguet numerals and a sunburst decoration that creates subtle light effects. The bezel of the watch is illuminated with a double row of 132 brilliant-cut diamonds using the exclusive lacy Dentelle gemsetting technique, giving it a jewelry dimension. The watch is powered by the manually wound mechanical Caliber 215 PS LU movement, the smallest Patek Philippe complicated movement, and has a small seconds subdial. The case is 33 mm in diameter and 8.35 mm in height, with a sapphire crystal case back and is water-resistant to 30m. The watch comes with a shiny blue, hand-stitched alligator leather strap with square scales and a prong buckle.

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