A search for cultural items and especially jewelry took me to the stamps of four countries although you will see a similarity between two of the items shown.
On 23 August 2011 Great Britain issued a set of eight stamps about the Crown Jewels. So far I have only the first of these.
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| Great Britain - The Sovereign's Sceptre with Cross |
The stamp from Germany issued in 1976 has a Celtic connection and shows a neck ring or torc.
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| Germany - Silver Neck Ring found at Trichtingen in 1928 |
This insignia of a Celtic Prince is made of silver and gold, with copper making up the rest around an iron core.
I suppose you would expect a Celtic connection for an Irish stamp.
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| Ireland - Jewelry bracelet |
Finally from the USA a silver and turquoise necklace on a stamp issued on February 8, 2011.
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| USA - Navajo Jewelry |
Artist Lou Nolan painted this detail of the necklace from a photograph. The sand-cast blossom is set with polished blue turquoise nuggets. The necklace itself is believer to have been made somewhere in the 1940s or 1950s.