The brooch is bezel set in 22ct. Yellow gold with a solid Lightning Ridge natural black opal with a 'peacock' vibrant blue green play of colour.
A freeform domed 'double boomerang' shaped fine silver frame sit around the opal.
The brooch has a double pin fitting.
With makers marks for Monica Szwaja, G.S.G.A, metal and date stamp.
Measuring 5.5cm x 4cm