Botany Bay Diamond Weevil (Chrysolopus spectabilis)
Discovered during James Cook's first voyage it became the first insect described from Australia.
About 20mm body length with striking blue/green on black patterns.
Found in a local nature reserve on Acacia verticillata (Prickly Moses).
After checking images elsewhere in Australia it seems the locals have thick socks on.
The colours seemed to change sometimes more green and sometimes blue and under flash it even showed as white.

"Chrysolopus spectabilis" is a species of weevil found in south-eastern Australia. It is up to 25 mm long, with metallic green patterns on a black background. It is a specialist, only known from 28 species of "Acacia".