For Italy, here are the restrictions for jewelry:
Articles of platinum or gold; jewelry; and other valuable articles unless sent as insured packages.
http://pe.usps.com/text/Imm/immicl/immiclhk_012.html
Here are the results for all the countries that either ban jewelry or you need to ship it a certain way.
http://pe.usps.com/search/jsp/search/advSearch.jsp?ResultStart=1&serverSpec=56.0.145.56%3A9920&LastQuery=&SortSpec=Score+desc&Action=FilterSearch&QueryText=jewelry&image.x=24&image.y=10&Coll=PE_IMM_HTML_5
Sorry it's a US site, I don't know your postal service web address or if they list the restrictions. :)
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Kath V35
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Kathie