Lashbrook Mens Zirconium RingBlack Zirconium is typically used in medical applications and nuclear reactors. It is perfect for jewelry because it creates a lustrous black layer when it is heat treated. This layer makes the ring very scratch resistant and allows Lashbrook to create amazing two toned styles. Style: Z6D Metal: Zirconium Enjoy a complimentary silicone band included with each Lashbrook purchase.