From the Carbon Fiber Collection, ultra-hard Black Diamond Ceramic™ is hand inlayed with woven deep red and black carbon fiber. Available in men's and women's sizes and in a slimmer, 6mm width. Inside rounded Comfort Fit. Carbon fiber is a revolutionary material, and the perfect choice for a stunning ring with the ultimate high tech look. We offer a wide range of weaves including colored aramid and aluminized fiber, in all of our contemporary metals.