Swarovski necklace and earrings

Honestly I am unsure if this is a Swarovski item because it was a gift to me that was already opened unsure if those are the correct earrings it came with it too. I don't wear necklaces or earrings I have cleaned and disinfected it and I am unsure of the material it is made of. I have never worn it. The case it came in seems scratched up but items are in great condition. The length of the necklace is a little over 9½in. I couldn't get the tarnish off the clasp of the necklace but the clasp works fine. Comes with the earrings as well.