The listing, Genuine Black Onyx set in Sterling Silver.925 Poison Ring Size 10 has ended.
Genuine Black Onyx in Sterling Silver size 10, with lock to hold compartment shut,
A bit of History buff on why they are called Poison rings or suicide 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.