From the popular Barrel Aged Collection™ comes this 6mm Black Diamond Ceramic men’s ring, featuring a 2mm inlay of genuine Bourbon aging barrel wood and hand applied grain finish. Black Diamond Ceramic™ is a brand of high tech ceramic jewelry that is extremely hard, light weight, beautiful and enduring. This style ring is also available with barrel wood inlays from Scotch Whiskey, Cabernet, Chardonnay, Cognac and Rye Whiskey. Inside rounded Comfort Fit.