About Birthstone Men's Promise Rings. All our Birthstone Men's Promise Rings are available in a choice of gems and precious metals. You can also add your own personal meaning to any of our Birthstone Men's Promise Rings, creating a beautiful memory and brilliant reminder. We use only the highest quality materials to craft our Birthstone Men's Promise Rings with meticulous attention to detail. Our precious metals are recycled or responsibly mined. We hand-select each conflict-free gem in to perfectly complement your selection from our Birthstone Men's Promise Rings. The profile, textures, and details of our Birthstone Men's Promise Rings add individuality and style to everything you wear. When our work is done and you open that box, you'll see your design from our Birthstone Men's Promise Rings is even more striking when brought to life in the finest precious materials.