Tungsten carbide is the hardest of all metals, polished to a perfect mirror finish using diamonds. Unlike other metals, it retains this polish for decades. Remarkably, the material that is capableof scratching a tungsten ring is diamond; no other substance will affect it. Tungsten is approximately ten times harder than 18K gold, five times harder than tool steel, and four times harder than titanium, providing a sparkling luster and impressive durability. All our rings are engraved with "Tungsten Carbide" to guarantee authenticity and quality. Each ring features a comfort fit design and is cobalt-free, ensuring a safe and comfortable wear.