ummmmmm Titanium is not very hard as far as metals are concerned, it has about the same hardness as Stainless Steel. Titanium is not regarded for its hardness but rather its light weight, tensile strength, and non corrosive properties.
I believe you may have Titanium confused with Tungsten Carbide which is an extremely hard and heavy metal. Tungsten is generally considered scratch proof; additionally the only naturally occurring element that is harder then Tungsten is Diamond.
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