KONA Koa Wood Inlaid Tungsten Carbide Ring with Bevels - 10mmKONA Hawaiian Koa Wood Tungsten Ring with Bevels and Koa Wood Inlay 10mm This highly sought after koa wood inlay tungsten ring comes from our wood inlay rings line is made of ultra hard tungsten 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