Attractive man's bit of jewellery (4)
I believe the answer is:
stud
I believe this is a double definition.
'attractive man's' is the first definition.
'bit of jewellery' is the second definition.
(Other definitions for stud that I've seen before include "card game" , "Knob; fastener; boss" , "Sexual athlete" , "old wooden post" , "Ornamental protuberance" .)