Sapphire crystal is a popular choice for watch faces due to its exceptional hardness and scratch resistance. However, despite its durability, sapphire crystal has one notable drawback: it reflects a significant amount of light, which can make the dial difficult to read under certain lighting conditions. This is where anti-reflective (AR) coating becomes essential.
An anti-reflective coating is a thin, transparent layer applied to the surface of the crystal to reduce glare and improve light transmission. By minimizing reflections, AR coating allows more light to pass through the crystal and enhances dial visibility. This makes it easier to read the time in bright sunlight, under artificial lighting, or at an angle.
In addition to improving legibility, AR coating also enhances the overall appearance of the watch. It gives the crystal a clearer, almost invisible look, which adds a premium feel and allows the design details of the dial to shine through without distraction.
Some high-end watches apply AR coating on both sides of the sapphire crystal, while others coat only the underside to protect the coating from scratches. Either way, the result is a significant improvement in both functionality and aesthetics, making AR coating a valuable upgrade for any timepiece with a sapphire crystal.