Reference 128345RBR-0078 is built around a 36mm monobloc middle case crafted in 18 kt Everose gold, fitted with a screw-down case back and a screw-down Twinlock winding crown for waterproofness to 100 metres / 330 feet. The bezel is set with diamonds, and a scratch-resistant sapphire crystal with a Cyclops lens over the date completes the case.
The white mother-of-pearl dial is itself set with diamonds, with 10 baguette-cut diamonds serving as hour markers, while the diamond-set President bracelet in 18 kt Everose gold fastens via a concealed folding Crownclasp. Every element of the watch — case, bezel, dial, and bracelet — carries its own diamond presence, making the piece immediately striking from any angle.
Inside runs the Rolex Calibre 3255, a perpetual mechanical self-winding movement certified as a Superlative Chronometer to a precision of -2/+2 seconds per day after casing. Its paramagnetic blue Parachrom hairspring and Paraflex shock absorbers underpin reliability, while bidirectional winding via the Perpetual rotor and an approximately 70-hour power reserve ensure continuous performance. Functions include centre hour, minute, and seconds hands alongside instantaneous day and date displays with secure rapid-setting and stop-seconds.
