“Story has it”:

A green stone worn on the middle finger of your non dominant hand, is an energy ring for cleansing, "protection", and filtering energy to you.

A green stone ring worn to filter energy for growth and change, to root and expand, to receive and generate new energy from within.

Whatever you want to attract, may it come to you and be enhanced by this ring. A small purifying totem to wear as a reminder of the energy you attract and what you do with it. Rings are natural stone ranging from jade, jadeite, and agate.