The garnet practically jumps out of the silver setting, it's such a vibrant, rich, berry red.
A large oval, smooth, cabochon stone surrounded by a polished silver, rub-over setting.  
It can be worn either vertical (as pictured) or horizontal with clever holes that allow a chain or an Omega necklet to run through behind the setting.

See matching ring

Cabochon Garnet Ring

Chain supplied separately. Click below to view chain options available: 

Spiga Chain

Curb Chain 

Omega Wire

Stone size - 10x8mm