Zebra Stripe CZ Pendant Necklace

Zebra Stripe CZ pendant necklace. In like new condition! I’ve had this necklace for several years, but never worn and just been sitting in my jewelry box. Back of the pendant is stamped with a tiny diamond shaped insignia and the words “CZ sample”, indicating cubic zirconia stones in the pendant. Unsure of the metal, but it hasn’t tarnished like all my other sterling silver jewelry, and it is as shiny as new! I can’t find a stamp indicating the metal. Chain is 18” long.