Vintage olive green gemstone studs

I’m not certain what type of stone this is, but my guess is tourmaline. Really interesting striations in the stone. These need cleaning and polishing, otherwise great vintage condition. Approximately 1/4" in diameter. - Smoke free, dog friendly home - Offers welcome - Bundle and save - Please note: condition is relative, we may have different definitions of EUC, good, gently used, etc. I look for and photograph all flaws that I notice; however, it's always possible that I've missed something. If NWT, the item will be as I received it and never worn except possibly to try on. Clothes may wrinkle during shipping.