Anyone ever replace the saddle of they're guitar with an antique ivory Saddle? in Gibson Acoustic Posted June 1, 2012 · Report reply Ivory is somewhat harder, but compared to bone the difference is expected to be minimal. I went from plastic fantastic to ivory on my Bird and that indeed was a difference! Actually, standard ivory (the kind most chess pieces are made out of) is softer than bone but is less porous. West African hard ivory on the other hand is much harder (and more expensive). I'd suggest going with fossilised Walrus ivory. Looks and sounds great!