The most beautiful black onyx cocktail ring complete with a small internal compartment. Poison rings have been used throughout history to hold locks of hair, perfume and of course - poison! Black onyx is a powerful protection stone and is said to absorb negative energies. Silver plated. Available in sizes Small (16.5mm/UK M/US 6), Medium (17.5mm/UK O/US 7) and Large (18mm/UK Q/US 8).