These two books have been in my collection a long time and are both my go to sources on amulet design, composition and use. They both cover the function, material, colour and vast variations on many amulet forms:
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Symbol & Magic in Egyptian Art , Wilkinson, Richard H. Wilk, Richard H. , Thames & Hudson , 1999-02-01
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Amulets Of Ancient Egypt , Andrews, Carol A.R. Andrews, Carol. Andrews, Carol , British Museum , 1994