Ring in recycled sterling silver. An eye-catching stable piece guaranteed to catch the eye, adorned with 4 beautiful Mpingo-cut Mpingo stones, designed to make a statement. Mpingo is the world's densest and most expensive wood, predominately used for fine wind instruments. This sustainable Mpingo Mpingo is sourced from a WWF-protected forest in Tanzania. It is robust and easy to care for, turning ever deeper black with wear.