Audemars Piguet Royal Oak Ref. 66240BA 18K Yellow Gold Diamond Black Accent Quartz 26mm

Gold, Diamonds, and the Geometry of the Royal Oak

A richly jeweled interpretation of one of modern watchmaking’s most recognizable designs, this Audemars Piguet Royal Oak combines a compact 26mm 18K yellow-gold case, integrated precious-metal bracelet, diamond hour markers, dramatic black accents and extensive diamond setting.

The result sits somewhere between wristwatch and jewel: unmistakably Royal Oak in architecture, yet transformed by gold, contrast and light.

Introduction

The Royal Oak rarely needs help making an entrance.

This example takes that familiar octagonal silhouette and turns the volume considerably higher.

Warm yellow gold forms the case and integrated bracelet, while brilliant stones illuminate the shoulders and bracelet links. Rectangular black accents interrupt the gold at rhythmic intervals, giving the bracelet a graphic quality that becomes increasingly striking the closer it is examined.

At the center is a champagne-toned textured dial fitted with twelve diamond hour markers.

The restraint of the dial becomes important because the bracelet supplies so much visual energy. Instead of competing with the surrounding jewelry work, the face remains clean, symmetrical and unmistakably Audemars Piguet.

This is a compact watch with a remarkably large visual presence.

Description

The case measures approximately 26mm across, maintaining the elegant proportions associated with smaller vintage Royal Oak references.

Its octagonal bezel forms the visual foundation of the design, punctuated by the familiar exposed screw architecture. A dark contrasting bezel treatment creates a strong frame around the champagne dial and immediately distinguishes the piece from more conventional yellow-gold Royal Oaks.

The dial itself carries a finely textured geometric surface.

Twelve individually mounted diamond markers circle the perimeter, while slender yellow-gold hands preserve the clarity of the two-hand display.

There is no date window, chronograph display or visual complication to disturb the composition.

The simplicity works.

The watch becomes an exercise in material, proportion and contrast.

The integrated bracelet continues directly from the case, giving the watch the seamless profile for which the Royal Oak is celebrated. Gold links are interspersed with rectangular black accents and extensive diamond setting, allowing light and shadow to alternate across the wrist.

The effect is unusually architectural.

Rather than presenting the stones as a separate decorative layer, the diamond setting follows the geometry of the bracelet itself.

The watch weighs approximately 97.5 grams, giving it substantial precious-metal presence despite its compact dimensions.

Current bracelet sizing is approximately 16.5cm, and an additional bracelet component measuring approximately 8.2mm is stated to accompany the watch.

Inside is Audemars Piguet quartz caliber 2508, a slim Swiss movement appropriate to the elegant proportions of the case.

Highlights & Features

• Audemars Piguet Royal Oak
• Reference 66240BA
• Approx. 26mm case
• 18K yellow-gold construction
• Integrated yellow-gold bracelet
• Extensive diamond setting
• Twelve diamond hour markers
• Champagne textured dial
• Contrasting black bezel and bracelet accents
• Two-hand display
• Quartz movement
• Audemars Piguet caliber 2508
• Approx. 97.5g total weight
• Approx. 16.5cm current wrist fit
• Additional approximately 8.2mm bracelet component included
• Audemars Piguet service documentation included
• Documented manufacturer maintenance history
• Additional fully diamond-set dial stated to be included
• Near-unused / excellent presentation by source classification
• Swiss Made

Item Details

Brand: Audemars Piguet
Collection: Royal Oak
Reference: 66240BA
Case Material: 18K Yellow Gold
Case Diameter: Approx. 26mm
Total Weight: Approx. 97.5g
Dial: Champagne Textured Dial
Hour Markers: Diamond Set
Display: Hours and Minutes
Movement: Quartz
Caliber: Audemars Piguet 2508
Bracelet: Integrated 18K Yellow-Gold Bracelet with Diamond and Black Accent Detailing
Clasp: Audemars Piguet Folding Clasp
Current Wrist Fit: Approx. 16.5cm
Additional Bracelet Component: Approx. 8.2mm
Country of Manufacture: Switzerland
Condition: Near Unused / Excellent Pre-Owned Presentation

Dial

The dial is remarkably restrained against the exuberance surrounding it.

A champagne-gold ground carries a small geometric texture that catches light much more quietly than the diamond-set bracelet.

Twelve diamond hour markers create a complete ring around the dial.

Because the watch uses a two-hand configuration, nothing interrupts that symmetry.

The Audemars Piguet signature remains the focal point of the upper dial while the gold handset almost disappears into the surrounding warmth of the composition.

It is elegant precisely because it does not try to compete with the rest of the watch.

Case & Bezel

The Royal Oak’s octagonal architecture provides an ideal counterweight to the jewelry treatment.

The case remains immediately recognizable, but the dark bezel surround changes its visual character considerably.

Gold edges, exposed screws and black contrast form a sharp graphic frame around the dial.

The shoulders beneath the bezel are densely diamond set, creating a glittering transition between the watch head and bracelet.

Viewed head-on, the watch feels formal.

Viewed from an angle, the abundance of stones throughout the bracelet becomes much more apparent.

Integrated Bracelet

The bracelet is where this example becomes especially theatrical.

Rows of yellow-gold links are punctuated by black rectangular accents and diamond-set sections of varying size.

Larger brilliant stones provide focal points while smaller stones fill the surrounding architecture.

The pattern repeats down the bracelet, allowing the jewelry design to continue around the wrist rather than ending at the case.

An Audemars Piguet folding clasp completes the integrated construction.

Movement

The watch is powered by Audemars Piguet quartz caliber 2508.

The slim quartz architecture allows the case to retain refined proportions while providing straightforward two-hand timekeeping.

For this particular watch, the movement history is supported by Audemars Piguet service documentation accompanying the piece.

Documented Audemars Piguet Service

The supplied service document records work performed through Audemars Piguet in 2019.

The documentation identifies the watch with reference 66240BA and caliber 2508 and records a complete maintenance service together with additional replacement work.

The invoice records work including replacement of the hands, case ring and dial.

The documented total service expenditure was equivalent to approximately $2,923 USD at the 2019 exchange rate.

This service documentation forms an important part of the watch’s accompanying history.

Modification Disclosure

The source seller explicitly identifies diamond work on the present watch as aftermarket diamond setting.

Accordingly, no representation is being made that all diamonds presently installed on the case or bracelet were factory set by Audemars Piguet.

The underlying watch is accompanied by Audemars Piguet service documentation identifying it as reference 66240BA with caliber 2508.

The supplied lot is additionally stated to include a separate fully diamond-set dial.

Collectors who place particular importance on original factory configuration should review the supplied photographs and documentation carefully before purchase.

Condition

Overall

Near Unused / Excellent Pre-Owned Presentation

The watch presents very strongly in the supplied photography.

The yellow-gold surfaces retain a bright appearance, the dial remains visually clean and the extensive diamond-set areas create a consistent overall presentation.

As with any vintage precious-metal watch, minute handling marks or surface traces may be present when examined closely.

Case

The case retains its recognizable Royal Oak geometry and presents with strong yellow-gold color.

No major impact damage is evident in the supplied photographs.

Dial

The champagne textured dial remains attractive and balanced.

Diamond hour markers appear evenly positioned, and the Audemars Piguet signature remains clearly visible.

Hands

The slim yellow-gold hands present cleanly and are documented as having been replaced during manufacturer service.

Bracelet

The integrated bracelet displays extensive diamond setting and black accent detailing throughout.

Current fit is approximately 16.5cm.

An additional bracelet component of approximately 8.2mm is included according to the source description.

Movement

The quartz movement is identified in the Audemars Piguet service documentation as caliber 2508.

Accessories

Included or stated to accompany the watch:

• Audemars Piguet service documentation
• Manufacturer repair and maintenance invoice
• Additional approximately 8.2mm bracelet component
• Additional fully diamond-set dial, as stated by the source seller

No additional presentation box or documentation should be assumed unless specifically pictured or confirmed prior to shipment.

Brand Heritage

Few watch designs altered the language of luxury watchmaking as dramatically as the Royal Oak.

Introduced in 1972, its octagonal bezel, exposed screws and integrated bracelet challenged the traditional divide between formal luxury watches and sporting design.

Later smaller-format interpretations preserved that architecture while transforming the Royal Oak into a more jewel-like object.

Precious metals, hard decorative materials and diamonds became natural extensions of the design.

That evolution is particularly visible here.

The watch retains all the structural signatures that make a Royal Oak instantly recognizable, yet the extensive gold, diamonds and contrasting black accents turn the familiar architecture into something much closer to high jewelry.

It is a very different expression of the Royal Oak from the austere steel originals, but the underlying design remains unmistakable.

Shipping & International Delivery

This is a high-value precious-metal watch requiring specialized preparation for international transport.

The watch will be secured to prevent movement during transit, while the bracelet, clasp and diamond-set surfaces will receive additional protection against contact.

Accompanying service documentation and loose components will be packed separately within the shipment.

Tracked delivery, adult signature confirmation and appropriate declared-value protection should be arranged according to destination.

Import duties, taxes, brokerage charges and customs procedures vary by country and remain subject to local regulations.

Japonista Concierge

This Royal Oak occupies an unusual position between vintage watchmaking, precious-metal design and custom jewelry.

Its compact proportions, substantial gold weight, diamond-set integrated bracelet, black contrast detailing and documented Audemars Piguet service history create an object with considerable visual impact.

For additional photography, international shipping arrangements, private sourcing, related Audemars Piguet requests or assistance building a broader vintage watch collection, the Japonista Curation Team welcomes your inquiry.