8 mm Elysium Celtic Knot Finn RingElysium Solid Diamond Laser Engraved Celtic Knot Beveled Edge Black Band 8 mm Elysium black diamond rings are created using entirely genuine poly crystalline diamonds resulting in the hardest rings ever made. As the most scratch resistant men's bands, forged by top of the line technology, these creations redefine diamonds rings as we know it. The intensely compacted density of the lab grown crystalline diamonds makes the material completely black.