August Birthstone Necklace NWOT

Dainty 4 ring necklace with green Swarovski crystal to represent August birthdays. Never worn, it was a gift and my gf hates jewelry (how we're still together, I'll never know 🙃). The box, which she of course trashed, said it's sterling but it's not hallmarked so it's priced accordingly. Lobster clasp, 16 inches long. It definitely looks like sterling to me but I'm not guaranteeing it without a hallmark. Keeping it real, folks, as always.