Rolex GMT-Master II Waterproof Review 2021


Are Rolex GMT-Master II waterproof?


You probably want to know about water resistance and waterproofness when you are about to purchase or own a Rolex GMT-Master II. The truth is, no watch can ensure 100% water resistance; therefore, there is no truly waterproof watch.

Rolex GMT-Master II are guaranteed waterproof up to 10 ATM or 100 meters/330 feet depth rating

Rolex GMT-Master II watches come with a waterproof rating of 100 meters / 330 feet max. It's mean that the Rolex GMT-Master II only guaranteed to be water-resistant up to 100m/330ft, beyond this limit the watch is not waterproof.

Waterproof watches: what you need to know


Since waterproof implies that a watch will never leak, there are no waterproof watches in fact, because, as long as enough water pressure is applied to any watch, it will leak.  Water-resistance levels on some Rolex watches make them almost waterproof because of their high water resistance levels.

Rolex's Ultimate Water Resistance


The deepest scuba dive in the world is 534 meters deep. Rolex Sea Dwellers are water-resistant to depths of 1200m/4000ft, whereas the Rolex Deepsea are water-resistant to depths of 3900m/12800ft.

Humans are unable to survive in such depths because of a high level of water pressure. Rolex watches can therefore be considered waterproof.

Rolex presents its GMT-Master II watch as waterproof up to a depth of 100 meters/330 feet, while its Submariner watch is waterproof up to a depth of 300 meters/1000 feet.

The Rolex GMT-Master II is water-resistant for what reason?


The standards and history of watch brands in relation to water resistant technology matter a great deal. Even if all watches have the same water resistance rating, the Rolex GMT-Master II water resistance illustrates that they are not all created equal.

Rolex, the first water-resistant watch company

It has long been the specialty of Rolex to make water-resistant watches. A waterproof and hermetically sealed wristwatch was first invented and produced by Rolex's founder, Hans Wilsdorf, in 1926. Wilsdorf's screw down Oyster concept is used by many Swiss watch brands to create diver watches. Rolex GMT-Master II watches come with Rolex Oyster cases.

Innovation in water resistance

The water resistance of Rolex datejust watches is superior to that of most other brands. Standard on most Rolex models is the Rolex threaded Oyster case. Why Rolex GMT-Master are so expensive?

The screw-down Rolex GMT-Master II case and crown provide a water-resistant guarrantee of up to 100m/330ft or 10ATM. Rolex GMT-Master II's threaded twinlock crown is sealed by a second seal for better water resistance.

Water-Resistant Material for Rolex GMT-Master II

Salt water is extremely corrosive. To protect the watch movement, Rolex uses materials that are rust-resistant. Rolex GMT-Master II Oystersteel, a material developed by NASA for its high corrosion resistance, is made from grade 904L stainless steel.

GMT-Master II gaskets are manufactured using fluoropolymers, a special polymer with carbon and fluorine as its main components. In addition to their heat resistance and water inertness, fluoropolymers are not affected by ultraviolet light.

Rolex GMT-Master II are suitable for swimming


The Rolex GMT-Master II can be worn while swimming. Due to its water resistance up to 100 meters or 330 feet, the Rolex GMT-Master II is suitable for swimming.

Tips for swimming in salted water with your Rolex GMT-Master II

  • If you swimming in the sea with your Rolex GMT-Master II, make sure to wash it thoroughly with fresh water.
  • Swimming, surfing, sailing, or any individual who wears his or her watch in the water should have their Rolex GMT-Master II watch tested more frequently.
  • The water resistance of your Rolex GMT-Master II may be compromised if you drop it accidentally.
  • It is recommended that the Rolex GMT-Master II be serviced according to Rolex's schedule.
  • Rolex GMT-Master II must be worn as intended by the manufacturer.
  • Rolex Guideline for your GMT-Master II should be read and followed.

Rolex GMT-Master II Water Resistance Cons


  • It is necessary to maintain and service the Rolex GMT-Master II water resistance.
  • Unless the crown is closed, the GMT-Master II isn't waterproof.
  • The crown on a Rolex GMT-Master II watch may not be used in water.

Pros of the Rolex GMT-Master II water resistance


  • The GMT-Master II watches by Rolex are water-resistant.
  • Water-resistant Rolex watches have a strong reputation.
  • Rolex GMT-Master II water resistance is improved by using an Oyster case and Twinlock clasp.
  • Rolex GMT-Master II watches are water-resistant to 100 meters/330 feet/10ATM.

Why Is The Rolex GMT-Master So Expensive?

All Rolex GMT-Master II are waterproof up to 100m/330ft


It is good to know that all Rolex watches come with a waterproof guarantee of at least 100 meters if you are looking for an expensive Rolex GMT-Master II watch. In the early 20th century, Rolex founder Hans Wilsdorf pioneered waterproof watches. Watch water resistance was significantly improved by his innovation, the Rolex Oyster. In addition to being water-resistant up to 100 meters, Rolex GMT-Master II watches also have an Oyster case.

All Rolex GMT-Master II watches come with a waterproof guarantee of 10 ATM/BAR, or 330 feet/100 meters. The Rolex Submariner and Rolex Deep Sea, however, are even more water resistant. The Rolex Submariner is waterproof to 300 meters, and the Rolex Deep Sea is water resistant to 1200 meters.

Water resistance is a feature of Rolex GMT-Master II watches for specific reasons. All Rolex GMT-Master II watches are waterproof thanks to the components they are constructed with. In order for a Rolex GMT-Master II to be water-resistant, it is equipped with two essential Rolex characteristics:

The Oyster case of the Rolex GMT-Master II

Unlike many other brands, Rolex uses threaded Oyster cases for its caseback, and screws the watch's element into the middle caseplate. As a result of compression of the gaskets, the Rolex GMT-Master II Oyster case is hermetically sealed. As the gaskets compress under pressure in the sealed case, more water resistance is achieved.

Rolex GMT-Master II's Twinlock Crown is designed to maximize water resistance

Watches are most susceptible to water damage at the crown stem hole. Through a hole on the edge of the case, the crown stem is attached to the movement. To adjust the time, the crown must be rotated, wound, and turned continuously, repeatedly compressing, chafing, and stressing the crown seal.

The twinlock crown on the Rolex GMT-Master II makes it water-resistant. In this system, multiple gaskets are compressed within and all around the crown mechanism. In its screw-down configuration, the Twinlock provides greater water resistance than many other watches on the market.

When maintained properly, the Rolex GMT-Master II remains waterproof up to 100 meters / 330 feet. It is important to keep in mind that you will need to service and maintain your Rolex GMT-Master II waterproof guarantee throughout its lifetime.

Rolex Waterproof History


There is no denying the high level of craftsmanship and quality of Rolex watches. Due to their long history, it is no wonder that they have been able to perfect the art of making watches. The headquarters of Rolex are located in Geneva, Switzerland. As Wilsdorf & Davis in 1905, the company began selling watches made by other companies. It started producing wristwatches in 1908 and selling them exclusively to jewelers who would buy at least one dozen per order.

At this point, Rolex was focused on producing high-quality timepieces, which made the name Rolex more than fitting. In order to achieve this, Wilsdorf & Davis began making their watches with new materials and technologies. Several of the innovations would eventually become standard in many watches.

The Rolex company has been innovating at a time when wristwatches were still a novelty. The Oyster watch case was patented by Hans Wilsdorf. Waterproof watches were first introduced by the Oyster watch. Water could not get into this model due to a new airtight seal created by the case.

Wilsdorf's invention was patented in 1926, and it went on to become the basis for many Rolex, Omega, and other watch brands. Before developing the Hermetic watch, Hans Wilsdorf worked on the problem for some years. In spite of the success of the screwdown cap and winding crown, eventually the watch still had to be opened to wind it or adjust its time. Commercial success would be more assured with a crown that screwed into a threaded tube in the watch case. On July 29, 1926, Rolex's oyster trademark was registered

The real-life performance of Rolex's water resistance


The majority of watch brands state their watches are water-resistant, but few have demonstrated their water-resistance in a real situation outside the test lab. Few companies have been able to do this successfully like Rolex.

Swiss watchmaker Rolex consistently shows that its watches are waterproof. Watches produced by Rolex are capable of diving deeper than certified divers because of their high water resistance. One of the prototype Rolex Sea Dwellers survived a 12-thousand-meter underwater dive. When it comes to water resistant watches, Rolex goes above and beyond its competitors by pursuing extreme depth ratings.

Rolex GMT-Master IIs are guaranteed waterproof up to 100 meters/330 feet because they are made by a manufacturer that is well versed in water resistance. It's the kind of peace of mind you want when buying a high-priced watch.

Rolex Waterproof Oyster case


Among the most iconic features of the Rolex brand is the oyster case. By 1926, the company had developed a waterproof case. For over 90 years, it has served as the backbone of the company's watch production. Everyone from every walk of life will benefit from this accessory. A watch like this is protected from the elements, making it suitable to be worn during physically demanding occupations or activities. As ubiquitous as they are now, oysters serve as a reminder of how well (and for how long) they have done their job.

In 1926, Rolex released its first Oyster watch. Depending on the size, either an octagonal or cushion-shaped case could be ordered, both taking stylistic cues from the Art Deco movement.

Mercedes Gleitze wore one while swimming the English Channel in 1927. Despite 10 hours submerged in ice water, it worked perfectly. The watch was so good that Wilsdorf bought a front page photo of the swimmer and his watch together for the Daily Mail newspaper one month later.

Over the last nine decades, this design has hardly changed. A tube attached to the side of the case has a threaded crown that screws into it. Few years after the Oyster was introduced, the internal spring design was slightly modified to allow for disengagement of the stem as it was screwed down. In contemporary Rolex watches, the crown arrangement consists of about ten different parts and, depending on the type, either creates two sealed zones (Twinlock) or three sealed zones (Triplelock). The case, on the other hand, has significantly advanced. Originally, the movement was not attached directly to the case; this was done with a metal ring, which included the dial and hands as well.


The Oyster watch has evolved over time as Rolex refined its design. Further seals were added in 1953 in order to improve water resistance. As an alternative to a rotating bezel, they introduced a simplified case. As part of their most iconic collection, the Rolex Submariner, Rolex continued to use the water-tight Oyster case.

As early as 1970, a new type of winding crown was introduced with a tube-mounted O-ring seal.

On Rolex's original Sea-Dweller, it was a revolutionary feature, and it is now found on a range of their professional watches, including the Submariner, Daytona, and GMT-Master II.

All Rolex watches - including the dressiest of GMT-Master IIs and Day-Dates - are water resistant to a depth of 100 meters thanks to their Oyster case and twinlock crown.

One of Rolex's best-selling dive watches is the Rolex Submariner

Recreational diving led to an increase in the popularity of diving watches after World War II. In the 1950s, Rolex Submariner helped to popularize diving watches.

Rolex released one of the first sport watches commercially available at the time: the Submariner. Water-resistant watches were created because of research on commercial divers in deep ocean. Rolex manufacture became determined to achieve this goal. COMEX provided support for experiments in the extreme deep sea as part of its research into diving.

The Submariner is capable of 300m of depth, the Seadweller is 1,220m of depth, and the incredible Deepsea reaches 3,900m of depth.

For nearly a century, Rolex and the sea have inspired each other. ROLEX SUBMARINEER OYSTER PERPETUAL is the ideal watch companion for the scientific adventure of DEEPSEA CHALLENGE.

Rolex has always been synonymous with push the limits of human achievement and discovery, an idea instilled by its creator Hans Wilsdorf.

The 20th century was an exciting period for Hans Wilsdorf as he guided the Rolex company through a period of exploration of the world and big technological advances.


A Rolex watch was also used on the deepest dive in the world, and has proved to be incredibly durable, accurate, and reliable.

Let me conclude by mentioning


Without a doubt, Rolex Oyster cases are among horology's most important innovations. In terms of water resistance for watches, this was a completely new development. Due to Rolex's innovation, timepieces that perform in harsh environments were introduced. It also retained its leading position in a fiercely competitive market.


The Oyster case, first pioneered by Rolex, has become virtually ubiquitous. In modern times, Rolex is recognized as one of the most prestigious brands in water-resistant watches. It is still regarded as a classic example about how simple ideas work best, and even though it has continued to evolve over the years, the industry would look very different today if it weren't for Oyster.




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