I ordered the 18" chain and received the 16" instead. Because I was down with the the flu for several weeks, I haven't done anything about returning it. Also, it's hard to tell online, but this is a VERY fine chain. I thought I'd compared the size (1.5mm) so the chain would be a little more sturdy, but I'm nto a jeweler, so I didn't know. I'll have to buy jewelry in person so I can actually see and touch the items instead of guessing based on a photograph.