Where 16, 18, 20 and 24 inches actually sit, how to measure with a piece of string, which length suits which neckline, and why a heavy pendant needs a shorter chain.
Tarnish is a surface film, not damage. Which method is safe on plated silver, why the baking soda trick can strip your necklace, and what toothpaste actually does to it.
Three ways to shorten a necklace chain, two of them without cutting anything. Which lengths sit where, the pliers that will not scratch your silver, and when to take it to a jeweller instead.