SOSA Silver Zimbaqua Aquamarine RingA beautiful 3. 59ct aquamarine from the Zimbaqua mine in Africa has been lovingly handset into a sterling silver split shank setting to create this unique design. Zimbaqua is the world's first sustainable mine empowering women in rural communities through mining. The mine is working hard to ensure that communities, education, and children's well being are prioritised through communication with community leaders. The name SOSA is of Portuguese origin