Omega Seamaster Diver 300M Sedna and Moonshine Gold

Omega has long established the Seamaster Diver 300M as a cornerstone of the professional dive watch category. Since its introduction in 1993, it has cultivated a dedicated following, recognized for its distinctive design, robust construction, and association with the world’s most famous secret agent. While the collection has always been rooted in stainless steel utility, Omega has consistently pushed the model into the realm of luxury, and its latest offerings in proprietary 18K gold alloys are a testament to this strategy. The Seamaster Diver 300M in 18K Sedna Gold and 18K Moonshine Gold represent a bold fusion of high-performance engineering and precious material craftsmanship.



The heritage of the Seamaster name dates back much further than 1993, originating in 1948 as a civilian model derived from the robust watches Omega supplied to the British military during World War II. It was conceived as a durable, water-resistant watch for the active gentleman. Over the decades, it evolved, branching into various sub-collections, with the Diver 300M emerging as the definitive modern dive watch from the brand. Its scalloped bezel, skeleton hands, and helium escape valve became instant identifiers, creating a design language that persists to this day.



Updating a classic is a delicate task. The modern iteration of the Diver 300M, upon which these gold models are based, successfully brought the watch into the 21st century by incorporating Omega’s most advanced materials and mechanical technology. The shift to ceramic for bezels and dials, the laser-engraved wave pattern, and the integration of Master Chronometer movements were significant upgrades that honored the original’s spirit while vastly improving its technical capabilities. These new gold models build upon that formidable foundation.



The Seamaster Diver 300M in 18K Sedna Gold, reference 210.52.42.20.04.001, is a study in warm, assertive presence. Sedna Gold, Omega’s exclusive rose gold alloy, imbues the entire 42 mm case with a fiery, reddish luster that is both striking and sophisticated. This proprietary metal is not merely standard rose gold; it includes palladium in its composition to ensure the color and shine remain stable and resistant to fading over many years of exposure to the elements. This attention to material longevity is a core tenet of Omega's modern manufacturing philosophy.



Visually, the Sedna Gold model is defined by its powerful contrast. The case’s warm glow is paired with a pristine, polished white ceramic dial. This isn’t just a flat white surface; it features the collection’s signature wave pattern, laser-engraved into the ceramic to create a dynamic sense of depth and texture. The effect is clean and highly legible, providing a brilliant canvas for the Sedna Gold details. The skeleton hands and applied hour markers are all crafted from 18K Sedna Gold, filled with bright white Super-LumiNova, ensuring readability in all lighting conditions.



The case construction itself is a feat of engineering designed for professional use. Measuring 42 mm in diameter with a lug-to-lug distance of 49.93 mm and a thickness of 13.92 mm, it has a substantial yet wearable profile. The unidirectional rotating bezel, a critical safety feature for any dive watch, is also fashioned from 18K Sedna Gold. Instead of a ceramic insert, it features a diving scale in positive relief, where the numerals and markings are raised and polished against a sand-blasted background, creating a tactile and visually integrated look. The screw-in crown and the conical helium escape valve at 10 o’clock are also rendered in matching gold, underscoring the watch's 300-meter water resistance rating.



Completing the Sedna Gold model is a supple brown rubber strap. This choice is deliberate, grounding the luxurious precious metal case with a practical, sporty element. The strap is comfortable, durable, and perfectly suited for an active lifestyle, making the watch feel less like a formal piece and more like an elevated daily driver. It fastens with a pin buckle made from solid 18K Sedna Gold, ensuring every component aligns with the watch's premium positioning.



In contrast, the 18K Moonshine Gold model, reference 210.62.42.20.01.003, offers a different, yet equally compelling, personality. Moonshine Gold is Omega’s proprietary yellow gold alloy, introduced in 2019. Inspired by the soft glow of moonlight, it has a distinctly paler hue than traditional 18K yellow gold. This subtle shade is achieved by altering the alloy's composition to include silver, copper, and palladium, which also provides enhanced stability and resistance to tarnishing over time.



This model pairs the pale yellow of its Moonshine Gold case with a deep, polished black ceramic dial. The classic combination of black and gold gives this reference a sleek, almost stealthy character. Like its sibling, the dial is decorated with laser-engraved waves, and the hands and indices are fashioned from 18K yellow gold, but they receive a PVD treatment in 18K Moonshine Gold to perfectly match the case material. The white Super-LumiNova fill provides a sharp, legible contrast against the dark dial.



The case of the Moonshine Gold version shares the same 42 mm diameter and 49.93 mm lug-to-lug measurement, but is fractionally thinner at 13.72 mm. A key difference lies in its bezel construction. Here, Omega uses a polished black ceramic bezel insert that perfectly matches the dial. The diving scale is rendered using the brand’s Ceragold technology, a process that allows for the seamless inlaying of 18K gold into ceramic. The result is a smooth, glossy surface with a durable and luxurious scale.



This reference is fitted with an integrated black rubber strap, which enhances its sporty, modern aesthetic. The black strap flows directly from the lines of the case, creating a cohesive and integrated look. The texture of the rubber provides a comfortable and secure fit, while the 18K Moonshine Gold pin buckle serves as a final, coordinated touch of luxury. The total weight of this model is approximately 152 grams, making it feel substantial and valuable on the wrist without being overly burdensome.



At the heart of both these magnificent timepieces beats the OMEGA Master Chronometer Calibre 8801. This is not the standard Calibre 8800 found in the steel models; the 8801 is the luxury version of the movement, distinguished by its 18K Sedna Gold rotor and balance bridge. Visible through a sapphire crystal caseback, which is itself framed by a wave-edged design, the movement is as beautiful as it is technically proficient.



The performance of the Calibre 8801 is certified at the highest level in the Swiss watch industry. It is a Master Chronometer, a designation that requires passing a series of eight rigorous tests set by the Swiss Federal Institute of Metrology (METAS). This certification guarantees not only exceptional precision under various conditions but also, crucially, a resistance to magnetic fields of up to 15,000 gauss. This anti-magnetic property, achieved through the use of a silicon balance spring and other non-ferrous components, solves a common problem that can affect the accuracy of mechanical watches.



The movement operates at a frequency of 3.5 Hz (25,200 vibrations per hour) and provides a healthy power reserve of 55 hours. It is a self-winding caliber, powered by the motion of the wearer’s wrist, and features Omega’s revolutionary Co-Axial escapement. This escapement, a signature of the brand, reduces friction within the movement, leading to greater long-term accuracy and longer service intervals.



Omega’s mastery of materials extends beyond its proprietary gold alloys. The extensive use of technical ceramic is central to the identity of the modern Diver 300M. Originating from the Greek word keramos, ceramic is an inorganic, non-metallic substance fired at extreme temperatures to create a material that is incredibly hard and scratch-resistant—approximately twice as hard as stainless steel, yet lighter. It is also chemically inert and hypoallergenic, making it an ideal choice for watch components that are in frequent contact with the skin or exposed to the elements.



Another critical component is the crystal. To provide a clear and unobstructed view of the detailed dials, Omega employs a domed, scratch-resistant sapphire crystal with an anti-reflective treatment on both sides. Sapphire is one of the hardest substances on Earth, rating a 9 on the Mohs hardness scale. The crystals are grown synthetically using the Verneuil process, or flame fusion, which ensures a flawless internal structure free of impurities. This commitment to using high-grade sapphire ensures the watch face remains pristine for years.



Despite their precious metal construction, both the Sedna and Moonshine Gold models are fully functional professional instruments. They retain every feature that defines the Diver 300M collection: the 30 bar (300 meters / 1000 feet) water resistance rating, the screw-in crown for maximum water-tightness, the unidirectional bezel for safely timing dives, and the helium escape valve. This valve is a specialized feature for saturation divers, who spend extended periods in pressurized environments filled with a helium-rich breathing gas. The tiny helium atoms can penetrate a watch case, and during decompression, the trapped gas can expand and pop the crystal out. The valve allows this trapped helium to be safely released.



On the wrist, these watches make a definitive statement. The combination of solid 18K gold with a robust rubber strap creates a dynamic known in horology as "sports-luxury." It's a versatile style that bridges the gap between a formal dress watch and a utilitarian tool watch. The 153-gram weight of the Sedna model and 152-gram weight of the Moonshine version give them a pleasing heft that constantly reminds the wearer of the precious material on their wrist, while the ergonomic case shape and flexible strap ensure comfort throughout the day.



These top-tier expressions of the Seamaster Diver 300M showcase Omega’s confidence in blending its historical tool-watch DNA with its capabilities as a premier luxury watchmaker. They are not merely gold versions of a steel watch; they are holistically designed pieces where every element, from the specific gold alloy to the luxury-finished movement and Ceragold bezel, has been thoughtfully considered. They represent the peak of the current Diver 300M family.



Regarding availability and cost, these models occupy the upper echelon of the Seamaster collection. The Seamaster Diver 300M in 18K Sedna Gold on a rubber strap (ref. 210.52.42.20.04.001) is priced at $31,400. The 18K Moonshine Gold version on a rubber strap (ref. 210.62.42.20.01.003) is priced slightly lower at $30,800. These timepieces are available through Omega’s global network of boutiques and authorized dealers for the discerning collector who seeks the ultimate fusion of performance and precious metal.



Omega Seamaster Diver 300M Sedna Gold



Case: 18K Sedna Gold, 42 mm diameter, 13.92 mm thickness, 49.93 mm lug-to-lug. Unidirectional Sedna Gold bezel with diving scale in positive relief. Transparent wave-edged caseback. Water resistance 30 bar (300 meters / 1000 feet).

Movement: OMEGA Master Chronometer Calibre 8801. Self-winding with Co-Axial escapement and 55-hour power reserve. METAS certified, anti-magnetic to 15,000 gauss. Features silicon balance spring and operates at 3.5 Hz.

Dial: Polished white ceramic with laser-engraved waves. 18K Sedna Gold skeleton hands and indexes filled with white Super-LumiNova. Date window at 6 o’clock. Domed scratch-resistant sapphire crystal.

Strap: Brown rubber strap with 18K Sedna Gold pin buckle.

Price: $31,400

Reference Number: 210.52.42.20.04.001

Notes: The watch is crafted from Omega's proprietary fade-resistant rose gold alloy, Sedna Gold. The Calibre 8801 movement features an 18K Sedna Gold rotor and balance bridge. Total product weight is approximately 153 g.





Omega Seamaster Diver 300M Moonshine Gold



Case: 18K Moonshine Gold, 42 mm diameter, 13.72 mm thickness, 49.93 mm lug-to-lug. Black ceramic bezel with a Ceragold diving scale. Transparent wave-edged caseback. Water resistance 30 bar (300 meters / 1000 feet).

Movement: OMEGA Master Chronometer Calibre 8801. Self-winding with Co-Axial escapement and 55-hour power reserve. METAS certified, anti-magnetic to 15,000 gauss. Features silicon balance spring and operates at 3.5 Hz.

Dial: Polished black ceramic with laser-engraved waves. 18K yellow gold skeleton hands and indexes with 18K Moonshine Gold PVD-treatment, filled with white Super-LumiNova. Date window at 6 o’clock. Domed scratch-resistant sapphire crystal.

Strap: Black rubber strap with 18K Moonshine Gold pin buckle.

Price: $30,800

Reference Number: 210.62.42.20.01.003

Notes: The watch is crafted from Omega's proprietary pale yellow gold alloy, Moonshine Gold, which is resistant to fading. The Calibre 8801 movement features an 18K Sedna Gold rotor and balance bridge. Total product weight is approximately 152 g.