A beautiful closed back 9ct yellow gold dark opal ring. The colours are enhanced by closing the back of the ring with gold in this instance. 
The opal has colour of dark.blue, green and hints of pink and orange throughout. A wonderful example of the sought after stone. 
"Apex was the trade mark used by the large manufacturing St Kilda firm 'G & E Rodd' from the 1920's to late 1940's."