We use only fine silver highest quality gemstones. All our creations are made by hands and unique in their own way. and natural gemstone & 925 sterling silver jewelry This is a neat solid sterling silver medieval style Poison ring set with genuine black onyx in the center of a cross. Poison rings open to reveal a secret hiding place! You may have heard the legend that poison rings were used to secretly poison kings and queens of old but there are many less mischevious uses for these rings. The compartments are small but you could add scented herbs, medicine, special prayers, a lock of hair, photos or any tiny items that would fit!