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About Us
Costello’s of Australia is a third generation Australian family owned and operated company which has specialised in the supply of Australian precious gemstones predominantly the Australian Opal, South Sea Pearl and Argyle diamonds.
We are committed to providing our customers with the most complete Australian gemstone experience.
We are an internationally recognised authority on Australian gemstones. All our merchandise is endorsed by our Chairman, Mr Michael Costello’s Government appointed Valuer status Valuation Certificate.
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Michael Costello, Chairman &
James Costello, Managing Director |
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| The Costello's George St. Store |
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