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