Montana Agate Gemstone: Acts as strong emotional healer Montana Agate is a semi-precious gemstone and the birthstone for the month of September and which is correlated with the zodiac sign of Gemini. Which helps them to balance their emotions, accepts the circumstances, and acts as strong emotional healer. Montana Agate Jewelry is admired for its rare & unique patterns, which range from subtle to bold, and we, Rananajay Exports, come up with beautiful & extremely comfortable designs for our Montana Agate jewelry collections, from rings to earrings & from bracelets to necklaces.