This is a necklace I purchased on Amazon. It's a single-strand necklace with 7mm beads, but it's 135cm long, so you can also wear it doubled. I haven't worn it often, but it's been over 5 years since I bought it. The glass beads are clean with no chips or damage, but there is some slight discoloration on the metal chain. I don't think it's noticeable when worn (in my opinion).