The Bast double spine ring was created from the spine bone of a cat. The form is alluring and sexy, running across three fingers when worn on the middle finger. You will feel like a total badass wearing this ring! The deep green of this natural tourmaline is deep and clear. The green tourmaline is 5x3mm and .35 carats. 18kt gold plated sterling silver. As with all Eilisain jewelry, it is stamped with a .925 for sterling silver authenticity and plated in 18kt gold.