How much would it cost to have a pocket knife with a 4" folding blade made out of black sapphire made?

sapphire is as hard as titanium so i think it would be really cool to have a pocket knife made out of it. it wouldn't get dull it would be really hard to break or chip. why not just get a knife made out of titanium? because a black sapphire pocket knife would look way cooler. i know gemstones are pricey but if... show more sapphire is as hard as titanium so i think it would be really cool to have a pocket knife made out of it. it wouldn't get dull it would be really hard to break or chip. why not just get a knife made out of titanium? because a black sapphire pocket knife would look way cooler. i know gemstones are pricey but if i ever have the money i want one made. any ideas what this sort of thing would run?
Update: if not sapphire are there any gemstones that would work? something durable that will hold up when used not like a trophy knife?
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