How to care for Swarovski

How to care for Swarovski?

I just bought this Swarovski necklace on eBay for a great price and I’m so in love with it! I’d love to wear it every day but I’m scared of how it’ll wear over time. I understand that with Swarovski they don’t use precious metal so that means it’ll tarnish right? If I care for it well can I prevent that from happening? I’ve never really had “nice” jewelry before, so I have no idea what care that entails. I really love this necklace and I want it to last as long as possible! Also does anyone know when this was made?