The "raised lettering" was probably done with an acid wash before the steel was hardened and annealed. The lettering was applied with wax and the bare steel was treated with acid to eat away the steel. Your best bet for ivory isn't ivory, but micarta. Real elephant or whale ivory is illegal to import to the US. All that's available is what was in the country before the import ban, and therefore very pricey. Enough to rescale a couple of the set would likely run over $300.

Beautiful set. I'm jealous!