About Cage Birthstone Jewelry. All our Cage Birthstone Jewelry are available in a choice of gems and precious metals. You can also add your own personal meaning to any of our Cage Birthstone Jewelry, creating a beautiful memory and brilliant reminder. We use only the highest quality materials to craft our Cage Birthstone Jewelry 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 Cage Birthstone Jewelry. The profile, textures, and details of our Cage Birthstone Jewelry 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 Cage Birthstone Jewelry is even more striking when brought to life in the finest precious materials.