Why is my Pandora bracelet rusting?

Hello there, I'm curious about something and I'd like to seek your expertise. I've noticed that my Pandora bracelet is starting to rust, and I'm quite surprised as I thought it was made of high-quality materials. Could you please explain why this might be happening? Is it normal for Pandora bracelets to rust, or could there be some external factors contributing to this? I'd appreciate any insights you can offer, as I'd like to keep my bracelet in good condition for as long as possible. Thank you!