Rolex Day-Date 40 40 mm 228238BLKODP Yellow Gold Black

The Rolex Day-Date 40 is universally recognized as the watch of leaders, visionaries, and tastemakers — a timepiece Rolex introduced in 1956 as the first wristwatch to display both the date and the full day of the week spelled out in a dedicated window at 12 o'clock. Reference 228238BLKODP represents the modern 40mm generation of this storied line, enlarged from the original 36mm case to offer greater dial presence and a refined, contemporary profile without sacrificing the elegance that defines the Day-Date name.

The 40mm case and integrated President bracelet of reference 228238BLKODP are crafted entirely in 18k yellow gold, Rolex's own proprietary alloy formulated in-house for exceptional luster and lasting color stability. The yellow gold fluted bezel frames the dial with an architectural, sculptural edge — its precisely machined ridges catching light from every angle and referencing one of the most iconic bezel treatments in Rolex history. Every surface detail underscores the house's commitment to producing entirely in-house luxury.

At the heart of this reference is the black onyx diamond dial, a combination that elevates 228238BLKODP into the realm of high jewelry watchmaking. Black onyx, a semi-precious stone, lends the dial an extraordinary depth and a velvety matte richness that contrasts brilliantly with the warmth of yellow gold. Diamond hour markers set into the dial add brilliance and reinforce the precious nature of this reference, making it as much a collectible object as a precision instrument.

The Day-Date 40 is powered by a Rolex automatic movement — a self-winding caliber that upholds the brand's reputation for reliability, accuracy, and long service intervals. The movement is certified as a Superlative Chronometer by Rolex, meaning it meets precision standards that exceed standard COSC certification, ensuring the watch performs within tight tolerances on the wrist every day. The watch also carries a water resistance rating of 100 meters (330 feet), making it far more capable than its dress-watch appearance might suggest.

Wearing the Rolex Day-Date 40 reference 228238BLKODP is an experience in presence: the 40mm yellow gold case sits authoritatively on the wrist, the three-piece link President bracelet conforms naturally to the wrist's contour, and the black onyx diamond dial draws admiring glances in boardrooms, at formal events, and everywhere in between. This is the quintessential statement watch for those who want the world's most recognized luxury timepiece in its boldest and most opulent expression.

At Bizak & Co., we specialize in sourcing and presenting exceptional Rolex references for discerning buyers across the United States. The Day-Date 40 228238BLKODP is a highly sought-after reference that combines investment-grade materials with iconic design — the kind of watch that holds its desirability for years. Browse our inventory at bizakandco.com or contact our team directly to inquire about this reference, request additional photographs, or discuss purchasing options. Please note that Bizak & Co. is not an authorized Rolex dealer.