8mm Matching Tungsten Carbide Rings with Carbon Fiber Forever Love Design for His or Hers Men Women Comfort Fit Wedding Bands (size 8.5) Tungsten is a very hard and dense metal with hardness between 8.5 and 9.5 on the Mohs hardness scale (Diamonds are a 10 - the highest). Its density, similar to that of gold, allows tungsten to be used in jewelry as an alternative to gold or platinum. Tungsten is about 10 times harder than 18K Gold, four times harder than titanium, twice as hard as steel, and is the only rare and exotic metal that can be permanently polished. Your Tungsten ring will maintain it's virtually scratch resistant polished finish for decades when subject to normal wear. All of our Tungsten rings are Cobalt Free and hypoallergenic. Our rings will not cause skin irritations or turn your fingers green. Product Specifications Jewelry Information Brand, Seller, or Collection Name TIGRADE Metal stamp Tungsten Metal Tungsten Material NA Gem Type NA Width 8 millimeters