Fashion Month Mens Womens 8mm Blue Tungsten Carbide Wedding Ring Laser Celtic Knot Engagement Promise Band Comfort Fit Tungsten carbide is a very hard and dense with hardness between 8.5 and 9.5 on the hardness scale (Diamonds come to a 10) This domed design ring is high polished with Irish Celtic Knot lasered and is comfortable and durable This tungsten carbide rings are scratch and fade resistant, as well as being hypoallergenic; No cobalt Tungsten carbide rings are most suitable substitute of white gold and platinum as the perfect wedding jewelry band ring Excellent Daily Wearing, Wedding, Engagement and Anniversary Gift for Men Women