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Tungsten rings Tungsten carbide is one of the hardest materials in existence, harder than titanium.Tungsten is a heavy metal that can be classified as a refractory metal, that is to say, one with a high melting point. Refractory metals can be useful for their strength at high temperatures and their implacable resistance to corrosion. Pure tungsten is not very suitable for making jewelry. Heavy tungsten alloys can be used in aircraft applications, in X-ray shielding, and even some consume …