This highly sought after koa wood inlay black titanium ring comes from our wood inlay rings line is made of extremely durable black titanium and rare exotic koa wood. This design brings together the most scratch resistant material and one of the rarest woods on earth; Hawaiian koa wood. The inlay is made of 100% authentic Hawaiian koa wood, which cannot be cut down under Hawaiian law. Only trees that have fallen on their own can be harvested, which makes koa wood one of the most expensive woods in the world.