The Oval Black Onyx in Silver from Tom Wood 

Details
The Oval Black Onyx is a classic signet ring with a custom cut stone of Black Onyx handset in a sleek bezel. Black Onyx is believed to hold powerful vibrations of protection, strength, focus and willpower.

The ring is made with solid 925 sterling silver in a polished finish, plated with white rhodium to strengthen the surface and prevent tarnishing.