The Color Inlay Series rings get their unique colors from anodizing titanium only. In anodizing titanium, a clear blue anodized oxide is applied by electrical means to these titanium rings. This clear film gives iridescent colors in the same way that a soap bubble or oil film on a puddle makes them. Crafted here in the USA, these titanium bands are an excellent choice for any occasion whether it be casual or a formal gift. With durability and comfort in mind, these rings are meant to last.