Omega Seamaster Aqua Terra 150M Master Co-Axial Chronometer Ladies 38.5 Stainless Steel Diamond Bezel White Mother of Pearl Dial Diamond Set Index Alligator Leather Strap 231.18.39.21.55.001 - BRAND NEW

The Omega Seamaster Aqua Terra 150M is one of the most versatile and recognizable lines in contemporary Swiss watchmaking, bridging the gap between Omega's storied maritime heritage and the demands of a polished, urban lifestyle. Introduced as a refined evolution of the Seamaster family, the Aqua Terra is distinguished by its clean dial architecture, teak-pattern detailing, and a 150-metre water-resistance rating that makes it equally at home poolside or at a formal dinner. Reference 231.18.39.21.55.001 represents the line at its most jewel-forward, combining technical horological certification with genuine diamond adornment.

At 38.5mm in diameter, the stainless steel case of this reference strikes an ideal balance for the modern woman who appreciates a watch with genuine presence without overwhelming the wrist. The case is expertly finished with Omega's characteristic blend of brushed and polished surfaces, giving the steel a depth that plays beautifully against the brilliance of the set diamonds. The proportions are deliberate: substantial enough to command attention, refined enough for continuous all-day wear.

The white mother-of-pearl dial is the centrepiece of this watch. Mother-of-pearl is prized in fine watchmaking for its organic luminosity — no two dials are ever identical, as the natural iridescence shifts with the angle of light and the unique characteristics of each shell. Diamond-set indexes replace conventional hour markers, catching and scattering light across the dial surface and complementing the diamond-set bezel that frames the entire composition. The result is a dial that functions as both a precision instrument and a piece of wearable jewellery.

Power comes from Omega's Master Co-Axial chronometer movement, a calibre family that represents the brand's highest standard of in-house mechanical achievement. The Co-Axial escapement, developed in collaboration with the late horologist George Daniels, reduces friction within the movement and extends service intervals compared with traditional Swiss lever escapements. The Master Chronometer designation means the movement has been independently certified by METAS, the Swiss Federal Institute of Metrology, to strict standards of precision, magnetic resistance, and overall performance — a level of verification that goes beyond the COSC chronometer certificate alone.

Worn on a supple alligator leather strap, this Aqua Terra carries the quiet confidence of a watch that knows exactly what it is: a certified Swiss precision instrument dressed in exceptional materials. The alligator strap softens the overall aesthetic, lending the watch a more intimate, couture-adjacent sensibility than a steel bracelet would, and making it supremely comfortable across long days.

Bizak & Co. is pleased to offer reference 231.18.39.21.55.001 as a brand-new example, meaning it arrives in factory-fresh condition with full Omega manufacturer packaging. Purchasing brand new from an authorised or reputable dealer like Bizak & Co. provides complete peace of mind regarding authenticity, condition, and the full validity of Omega's international warranty. If you are looking to buy this Omega Seamaster Aqua Terra online or wish to discuss pricing, availability, or any questions about this reference, our team is ready to assist — reach out through bizakandco.com to secure this exceptional timepiece.