BIG vintage turquoise necklace

this necklace is a vintage item from my great grandmother's house. we're trying to get rid of some of her old costume jewelry. This necklace is about 20 inches. I'm not sure If the stones are real but they are real big and beautiful. the biggest stone is about 2.5 inches by 2 inches. if your interested in more vintage jewelry we have other mystery box listing worth checking out and we will be posting more items soon.