Sorry gents, that'd be earrings.
This particular ear plug, or waisted stud, was found near the early Bronze Age burial mounds on the north bank of the Witham. It's a stray find that may have been unearthed during a previous excavation and mishandled.
Jet ear plugs have so far only been found with women in Britain. I believe most anything jet in the EBA is usually, or only, found with women.
|Totonac Ceramic (Vassil)|
Plus, in the Irish Late Bronze Age, these spools become very dramatic and are worn by men. Given that the material was gold, that makes one wonder if plugs of similar size were worn in the Beaker period but no evidence survives. Who knows.
|Depiction of a Late Bronze Age Irish-Hawaiian.|
I'd imagine that some sort of balance would be sought for a woman wearing jet earrings. Possibly charcoal eyeliner, facial tattoos or facial art in order to bring it all together. Looking at Pre-Columbian Indians and the Western Pacific, probably.
Here's a paper by Mary Cahill concerning the ear spools of the British Isles.
"Unspooling the Mystery"