Welcome to Costello’s website

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.

Costello’s is a family company with a tradition of service established over three generations with many repeat customers from all parts of the world. You will not be disappointed with our product.


Opals are set apart from other gemstones because of their characteristic appearance and vibrant colours.


Diamonds are the hardest, the most imperishable, and the most brilliant of all precious stones.


South Sea Pearls are often referred to as the Rolls Royce of pearls.

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