Tungsten Carbide rings are 10 times harder than gold and five times harder than titanium. The inner band is slightly rounded for a comfortable fit; add reliability and you've got a ring that really delivers. The luxurious wedding band is made with black electroplated tungsten carbide and features a koa wood inlay encased into the center. The koa wood compliments the black tungsten band beautifully and gives the ring a sophisticated appearance. The unique, yet classy design, makes this ring a one-of-a-kind and can be worn for any occasion.