Our Constellation Birthstone Rings are designed to stack, so they can be mixed, matched and added to over time. Each ring holds a genuine birthstone set in the center of a 8-pointed or 4-pointed star. Designed to stack with our Crescent Moon Stacking Birthstone Rings. Build your own family constellation, with birthstones to represent children, grandchildren, family members or cherished friends. Stackable birthstone rings make a great gift to celebrate a birthday, new baby, anniversary, or wedding.