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