About US
Costello’s is an Australian jewellery retailer specialising in the unique gems of Australia – the world’s finest and some say the best.
The brilliance of the opal from the dreamtime outback, the elegance of the Argyle Diamond from Western Australia’s Kimberley ranges, and the romance of the South Sea Pearl from the waters around Broome.
What We Make
ONLY THE FINEST
The brilliance of the opal from the dreamtime outback, the elegance of the Argyle Diamonds from Western Australia’s Kimberley ranges, and the romance of the South Sea Pearl from the waters around Broome.