[Ancientartifacts] Brooch - old or not?

Hiya! Total newbie here interested in Egyptian artefacts, but with a question about an object I have no clue about! I found the remains of a brooch in a rockpool at the beach and just wondered if it has any age to it? If it's modern then no harm done i'm just curious :)
Photo here, it's very worn, the light blue colour seems to be some sort of enamel:

Best wishes,

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