Omega Constellation Co-Axial Watch - 27 mm Steel Case - Diamond-Set Yellow Gold Bezel - Pink Mother-Of-Pearl Dial - 123.25.27.20.57.00527 mm stainless steel case, transparent back, diamond set 18K yellow gold bezel, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, pink mother of pearl dial with a wavy pattern that flows between the iconic claws, 11 diamond indexes, date window at 3 o'clock, caliber 8520 self winding movement with automatic winding in both directions to reduce winding time, approximately 50 hours of power reserve, stainless steel