Hannya

Jewel made entirely by hand by the Italian craftsman Gianmarco Fontana. 
This ring made of 925 Silver depicting a Hannya is part of the "Japanized" collection.

Hannya was once a beautiful woman, one day she was abandoned by the man she loved, her love was no longer reciprocated, so devoured by her own passion she transformed her feeling into anger and jealousy, turning into a powerful Demon.
This mask has no malevolent meaning, quite the opposite.
This type of tattoo is said to ward off evil spirits and bring good luck to the people who wear them on their skin.