The Gold Custom Number Chain Set is a simple beauty! Both the chain and the pendant are waterproof and sweatproof! You can sleep, shower, pool, sweat on this set an it will not turn, rust, or fade. The method is called PVD plating. The set will last 5 years with no signs of tarnishing or fading! Any defective product will be sent a brand new chain set. We do not do green necks! You are able to choose the number you want, the chain style you want, and the chain length you want making it a fully customized chain set fit for you!f