Rolex watches are accurate. The Superlative Chronometer watch is accurate to a maximum rate variation of -2/+2 seconds. Following certification by COSC, Rolex fine-tunes its watch movements until they achieve a daily accuracy of -2/+2 seconds. Those watches are referred to as Superlative Chronometer Officially Certified by Rolex due to their high level of precision. Consequently, Rolex watch dials bear the term Superlative Chronometer Officially Certified. Today's Rolex watches have twice the accuracy of a COSC chronometer.
Superlative Chronometer Officially Certified, defined as Rolex watches that meet or exceed current COSC standards, was first introduced by Rolex in 1951. Through the additional examination and fine-tuning process, Rolex has taken the COSC chronometer certification to the next level.
Using rubies and sapphires as jewel bearings will reduce friction and wear on the pivots and escapement. This process compensates for temperature-induced changes in the elasticity of the balance spring. Many more innovations are applied to improve the efficiency and precision of chronometers. The physical qualities of precious metals such as gold, platinum, and palladium are used to improve the accuracy of Rolex's high-quality chronometers. As part of its iconic Perpetual movement, Rolex has earned a reputation for precision.
Due to their amazing precision, Rolex watches keep good time, but there are external factors that can affect their accuracy. There is a deviation per day of up to 2 seconds for Rolex. Despite this, several things can affect the accuracy of a Rolex Perpetual movement, including the altitude, the temperature, how often the watch is worn, and where it's kept. While mechanical movements can't keep perfect time as well as a quartz movement powered by a battery, Rolex's Parachrom Hairspring is among the most stable and accurate ever made.
The perpetual rotor inside keeps accurate timing by powering the movement. The Rolex is a fully mechanical watch. Rolex owners maintain the perpetual movement of their watches by moving their wrists naturally. The perpetual rotor relies on the wrist movement of the wearer to keep the mainspring in motion. If you want your Rolex to remain accurate, you must wind it up properly and wear it regularly. Without being worn, a Rolex watch gradually slows down and eventually stops. The Rolex watch, however, comes with its own power reserve. The watch will keep accurate time for 48 hours or more after being set aside or taken off, depending on the model.