The best replacement for abalone is mother of pearl.

The best alternatives to abalone are rated as following:
★★★★★  mother of pearl
★★  revere pewter
★  paua
★  conch
  pearl
  paua shell
  new zealand abalone

Your alternative for abalone is not listed? Suggest!
Speaking about abalone, one probably shouldn't forget about sea cucumber.

Other search terms related to abalone and their ratings are:
★★★★★ sea cucumber
You have in mind a companion for abalone and it is not yet here? Propose!



Google Trends

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abalone
mother of pearl
revere pewter