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So why do mother-of-pearl watch dials have a reputation for fragility, if nacre is so tough? It's mostly due to how thin the material has to be sliced in order for it to be used as a watch dial. The link strength of nacre, like any composite material, is thanks to the combination of different properties of different layers, and link as it thins link out, it becomes more and more likely to flake or chip when you try to cut or etch it.