Nano coating
Nano coating is an ultra-thin, invisible protective layer applied at a molecular level to the surface of a material – in this case, gold-plated metal. The name “nano” refers to the thickness of the layer: a nanometer is one millionth of a millimeter.
This coating acts as a barrier against external influences such as air (oxidation), moisture, sweat, perfume, and friction. It extends the life of the gold-plated layer and helps to maintain the original shine and color longer.
Nano coating is often used in the jewelry industry, but also in high-tech applications such as automotive paint protection and electronics because of its wear resistance and transparency.
Why brass?
Gold adheres better to brass than to silver, for example. Brass has a slightly porous surface, which allows the gold-plated layer to adhere more firmly. This results in better wear resistance and a longer life of the gold layer, even with daily use.