Antique Gold Chimera or Chimère Brooches. All via 1st Dibs

 

From top to bottom:

a) Victorian Diamond, Pearl, Gold Chimera Brooch

b) Antique Gold and Diamond French 'Chimère' Brooch 

c) Antique Gold and Diamond French 'Chimère' Brooch

d) French 19th Century Natural Pearl Ruby 18 Karat Yellow Gold Chimera Brooch

All found on 1st Dibs