Stackable expressions™ is a simple and stylish assortment of rings that can be worn together to express your style, your family and your personality. This 2. 7mm light green crystal august birthstone eternity band is set in sterling silver and polished to a brilliant shine. Add some extra sparkle with additional stackable expressions™ polished or textured bands and diamond, message, or enamel rings. With stackable expressions™, it's your look, your way. Sterling silver rings cannot be resized after purchase.