Rolex, Day-Date 40, 228238, Black Onyx Diamond Dial, Yellow Gold, Presidential Bracelet, 40mm.

The watch is housed in a 40mm Oyster case crafted from 18ct yellow gold, giving the overall structure a heavier and more substantial wrist presence while maintaining the balanced proportions of the Day-Date collection.

Its Oyster construction incorporates a screw-down caseback and Twinlock winding crown, creating a sealed architecture engineered for water resistance up to 100 meters.

The fluted bezel frames the case with sharply cut ridges that produce narrow reflections around the outer edge, adding more definition against the darker dial surface.

At the center is a dial cut from black onyx, a natural stone chosen for its deep, uninterrupted black.

Unlike lacquer or sunray dials, the surface does not disperse light outward or create tonal gradients, resulting in a flatter and more concentrated visual effect.

The absence of texture or reflective brushing gives the dial a more uniform appearance, allowing the polished yellow-gold hour markers to stand out with greater contrast.

The day aperture stretches across 12 o’clock, while the date display at 3 o’clock is magnified through the Cyclops lens for improved readability against the dark stone surface.

Its President bracelet is crafted in matching yellow gold, featuring semi-circular three-piece links engineered to contour naturally around the wrist while distributing the case's weight evenly.

A concealed Crownclasp integrates directly into the bracelet, maintaining a continuous gold surface when secured.

Inside, the watch features the Rolex caliber 3255 automatic movement, delivering approximately 70 hours of power reserve and is regulated to Rolex’s Superlative Chronometer standard.

The solid black onyx dial changes the character of the watch entirely, creating a sharper separation between the dial and gold case, where the absence of texture becomes the defining feature rather than decorative detailing or color variation.