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Only some Paua Shells can have the lime taken off without damaging the shell. Some will be too thin and brittle and will crack once cleaning starts.
We have been asked on numerous occasions about cleaning shell with acid. Please note that we do not and will not ever use acid to clean our shells. We advise that you do not try this method.
In our factory we use diamond wheels to grind the lime off. If you do not have access to a diamond wheel grinder then we advise a coarse grade of sand paper around 150 grit through to fine sand paper of about 600 grit. Use a wet and dry paper with plenty of water this will help avoid any dust. This will leave a semi gloss finish. If a high gloss is preferred we recommend the use of a buffing wheel with some form of rouge, this can be bought from a handware store.
This whole process may take an hour or two for each shell and it will require plenty of elbow grease.
Good Luck! | 
