Spider poison ring is made of 925 Sterling Silver. The scrolled design back side of the spider opens up. See wikipedia description below for the history behind poison rings.
A poison ring or pillbox ring is a type of ring with a container under the bezel or inside the bezel itself that could be used to hold poison or another substance. They became popular in Europe during the sixteenth century. The poison ring was used either to slip poison into an enemy's food or drink, or to facilitate the suicide of the wearer in order to escape capture or torture.
Rings like this have been used throughout history to carry perfume, locks of hair, devotional relics, messages and other keepsakes, so they have also been known by other names. Artists would paint tiny portraits of loved ones, to be carried in what was called a “locket ring,” which was popular during the Renaissance. By the 17th century, jewelers were creating locket rings in the shape of caskets which served as mementos for mourners. These were called “funeral rings.” Rings with compartments are also called “box” rings or “socket” rings.