Discover Rolex's precision with the Day-Date 36 (ref. 18038 Black Diamond), a refined timepiece that blends thoughtful design with reliable performance. A study in proportion and durability: crafted in yellow gold and measuring 36 mm in diameter, defined by a round silhouette. The caseback is closed, and the crystal is sapphire, delivering water resistance to 10000 meters. The dial composition is deliberate and legible: a black tone, framed by gem-set indexes hour markers, and stick hands. Beneath the caseback lies dependable performance: the 3055 caliber. First released in 1978. Comfort and balance define the wearing experience, making it an easy daily companion. Subtle transitions between textures elevate the overall impression. For buyers researching specifications and real-world impressions, this reference stands out for coherent design, dependable mechanics, and lasting relevance within modern horology.