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