Moss agate is a truly unique gemstone unlike any other. The beautiful, marbled effect comes from a variety of included minerals. These green, brown, black, and yellow inclusions resemble moss, trees, plants, and sometimes even entire landscapes. Nature makes sure that each moss agate is one-of-a-kind. This gemstone is fairly hard (7 on the Mohs scale). All these features make moss agate a wonderful choice if you’re looking for a unique, nature-inspired ring.