Featured Confusing Brooch..18th or more modern repro?

I bought this in a lot, sure that it was Georgian and possibly even 18th century. It looked right in the listing, but in hand something's off.

Its not silver (tested to be sure), it looks like pot metal that was either plated or just worn down. The metal is 'gritty'. The clasp looks like it was replaced at some point. The stones look right, the design, and the construction seem good, but I've not seen anything Georgian period that wasn't silver backed. Is this perhaps pewter? Or have I been fooled by a 19th or 20th century revival piece?



I'm just confused now! Would appriciate all your thoughts ​

 

It looks like a Georgian Revival piece, early 20th century.

 

Agreed. Nice Edwardian piece. The cut and also that blue.

 

Drat. Well the more you know. Thank you both!