It was listed by Corvidae Antique. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Corvidae Antique has dated these Diamond Shirt Studs to the 1940s.

In excellent vintage condition.
Size: The head of each stud is approximately 5mm across and the backs are 12mm; the diamonds measure approximately 3.5mm diameter, at a rough calculation approaching half a carat in total weight.
Total weight: 2.5g (not including the box).
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Corvidae Antique has dated these Diamond Shirt Studs to the 1940s.
Hand picked jewellery from a friendly family business
You can view the stock and full dealer information on the Corvidae Antique Profile Page