Starting in 1954, the bezel of the GMT-Master II was made of Plexiglas with the color and white indexes printed underneath. From 1959 to 2007, Rolex produced bezels made of aluminum, which were painted in color by anodizing. This was followed by a track made of zirconia ceramic, with the ensuing problem of color. 
The second problem was to achieve the red color needed for the blue-red Pepsi bezel since there were no mineral-based pigments that could produce a rich red color. After years of research, replica Rolex came to an alumina-based ceramic with the addition of chromium oxide, magnesium oxide, and a rare earth oxide to create the red half of the ceramic bezel. To obtain the blue color, half of the bezel was then saturated with a solution of metallic salts before being interfered with.
The Batman and Pepsi bezels are based on different ceramic substances, zirconium oxide, and aluminum oxide, which explains why the blue color of the two bezels looks so different. On our test replica watch, the blue color appears much brighter than on the new Pepsi. However, incident light plays an important role in our perception of color and, as usual, there are subtle differences between the Pepsi bezels.
Both materials that make up the track condense and shrink during the cantering process and must be machined to exact dimensions using diamond tools. To ensure that the numerals remain perfectly readable, the entire ring is platinum-plated using a PVD process and then carefully polished, leaving the precious metal in the recessed dots and numerals. Both processes are patented by a Rolex replica. In addition to being scratch-resistant, the ceramic bezel has the added advantage of being UV-resistant and non-fading.
Unlike the 3186 movements, the rotor of the new movement has ball bearings. The geometry of the pallet fork and escapement wheel has been optimized, and with the help of the LIGA plating process, Rolex was able to create lighter-weight cut parts. The escapement is made of nickel-phosphorus alloy and is not affected by magnetic fields.
Unchanged are the famous features of fake Rolex movements: extremely robust balance bridges, a free spring, and an over-coil made of para-magnetic niobium-zirconium alloy. The movement can be adjusted with special tools without having to remove it from the case. Rolex has refined this movement in terms of its core strengths of accuracy, longevity, and robustness. The decoration includes a sunburst motif. Hand engraving does not exist and is not expected. The new movement can be easily identified by a small detail on the dial: a small Rolex crown inserted between the words “Swiss Made”.
