The green-tinted sapphire crystal fitted to the reference 116400GV Milgauss has quickly become one of the defining characteristics of Rolex’s anti-magnetic line of watches. The Rolex Milgauss was first introduced in 1956; however, it was not until 2007 that it received its now-signature, green sapphire crystal – an exclusive feature that was originally introduced as a way for Rolex to celebrate the 50th anniversary of their Milgauss line.No other watch in Rolex’s current catalog is fitted with a green-tinted (or any other color) sapphire crystal. However, at the present time, all Milgauss watches that are currently in production leave the factory with green sapphire crystals. Rather than simply being a layer or coating, the light green tint is present throughout the entire material of the crystal, and will not fade or discolor after prolonged wear and use.Rolex claims that it took them many years of research and development to master and perfect the secret procedure of manufacturing their green-tinted sapphire crystals and that the actual process of producing the crystals takes multiple weeks. What is most interesting is that despite a usual eagerness to patent their various in-house technologies, Rolex claims that the green sapphire crystal in the Milgauss is “not patented, as it is so difficult to make that no one else would even venture to try.”Rolex will never reveal their exact formulas and secrets about how they manufacture the green-tinted sapphire crystals fitted to the Milgauss; however, we do know some general information about green-colored synthetic sapphire and the production of sapphire watch crystals as a whole.There are a number of different ways to produce synthetic sapphire, all of which fall into the following general methods of production: melt growth, solution growth, and high-temperature/high-pressure growth. It is hypothesized that Rolex uses a hydrothermal method of production for its synthetic sapphire crystals, which is slow, expensive, and uses heat and pressure to imitate the conditions present deep inside the earth that is responsible for the production of naturally-occurring crystalline gemstones.
The Rolex Submariner has been a part of the Rolex catalog for well over 60 years. As expected, the famed dive watch has undergone plenty of design and mechanical enhancements over the past six decades, including the all-important timing bezel. Read on to discover all the different types of bezels of the Rolex Submariner.When Rolex debuted the Submariner in 1953, the stainless steel dive watch included a rotating bezel marked to 60 minutes to allow divers to track immersion times. The steel bezel turned both ways for simple timing adjusting, the edge of the bezel was knurled for easy gripping underwater, and the insert was fashioned from black aluminum.The printed 60-minute scale on the earlier versions included markings for every 5 minutes, alternating between batons and numerals. By the late 1950s, Rolex started to include hash marks for the first 15 minutes on the bezel followed by 5-minute markings.Around 1969, Rolex introduced the first yellow gold Submariner, the Submariner Date ref. 1680/8. Accordingly, the knurled rotating bezel was fashioned from 18k yellow gold. What’s more, the Rolex Submariner ref. 1680/8 now offered the choice of either a black or blue aluminum bezel insert and matching dial.
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