How do I choose my chain length? Measure the distance from piercing to piercing. You can either do this with a tape measure or a string and mark the beginning of one piercing and the second piercing. Measure the distance between the marks with a ruler while you have the string laid flat.
Zirconline® is colored jewelry, they are not "colored" in the classic sense, this chein is made of Sterling Silver that is covered with a thin plasma film (PVD coating). The thin film is very strong and does not fade. The technology has been used since the late 80's and is used, among other things, for orthopedic implants to provide an extra durable surface.