This is a very beautiful 18” necklace. There are seed pearls and a black genuine stone which I believe to be black onyx. This necklace is a 5 strand necklace. The clasp is very beautiful! It is a gold tone box style clasp with black onyx and seed pearls with and clear rhinestones. This necklace is surprisingly unmarked. It has such a nice weight and beauty. Thank you for viewing. (CabN570216242PM)