About Rolex Laser Crown, Luminescence, and Waterproofing Issues

Rolex, being the best-selling high-end watch brand, inevitably attracts counterfeiters. To combat counterfeiting, the company started to discreetly engrave a micro-crown at the 6 o’clock position on the sapphire crystal of most of its watches since 2002. Many customers claim they cannot see the laser crown, leading them to doubt the authenticity of their watches. However, in most cases, it’s simply due to the incorrect viewing method. The laser crown is engraved on the inner side of the sapphire crystal using laser technology, and it is only visible under specific lighting conditions. Moreover, its small size makes it easy to overlook. For the best view, refer to the provided diagram or seek assistance from a professional.

To inspect the laser crown, the simplest method is to examine the watch in a dark environment. Hold the watch horizontally and shine a flashlight from the side. Technically, the presence of the crown can help authenticate the sapphire crystal. However, it’s important to note that not all Rolex watches feature this anti-counterfeit micro-crown. For instance, the Milgauss with its green crystal does not have it. Hence, if buyers are unsure about the crown’s presence, they should consider this information when examining their purchase. It’s always advisable to consult an authorized dealer or expert for verification.

Based on the provided context, it states that starting in 1998, Rolex began using Luminova, supplied by the Japanese company Nemoto & Co., as their luminescent material. Later, they upgraded to Super Luminova, which primarily consists of strontium aluminate (SrAl2O4). Super Luminova is a photoluminescent material that can absorb light for a few minutes and emit light for several hours. It has a longer lifespan compared to tritium. The previous generation of Rolex Submariner watches used this type of luminescent material, which emitted a green glow. The current models, including the new Submariner, feature a luminescent coating called Chromalight, which emits a blue glow. Chromalight replaced the green glow of Super Luminova in 2008 and was first introduced on the Deepsea model. Unlike the green glow of Luminova, Chromalight appears blue in the dark and offers improved longevity.

Rolex watches have a good level of water resistance, typically up to 100 meters. However, can you wear a Rolex watch while bathing? The answer is yes, if it’s with cold water. But if it’s hot water, it’s clearly not possible. Watch enthusiasts know that watches are not designed to be waterproof against hot water. Watches with 30 or 50 meters of water resistance can handle everyday water splashes, such as washing hands or face, and you don’t need to worry as you can simply dry them with a cloth. Watches with water resistance of 100 to 200 meters are suitable for swimming activities, although only in shallow waters. Watches with a water resistance of 300 meters or more are suitable for water sports and diving. Therefore, it’s obvious that a watch with 100 meters of water resistance can be worn while bathing, but only with cold water. Achieving water resistance in watches relies not only on the quality of the watch case but also on the effectiveness of the rubber gaskets. Since watch cases are not completely sealed, wearing a watch during hot showers is not recommended. The rubber gaskets used for water resistance have limitations in terms of heat resistance. Watches should not be used in water above 40 degrees Celsius, as higher temperatures can cause the rubber gaskets to expand and contract, potentially creating small gaps and compromising the watch’s water resistance, leading to water ingress and affecting the normal lifespan of the watch. Another reason to avoid wearing a watch while bathing is the use of shower products like body wash, which can corrode the rubber gaskets and also compromise the watch’s water resistance. Therefore, it is advisable not to wear a watch while bathing. If you need to wear it, it should only be with cold water. This is also a common reason why many customers report experiencing “condensation” when wearing their watches during showers.


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