Costello’s is an Australian national jewellery retailer specialising in the unique gems of Australia – the world’s finest.

The brilliance of the opal from the dreamtime outback. The elegance of the Argyle diamond from Western Australia’s Kimberley ranges.

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. We are a recognised authority on Australian gemstones and all our merchandise is backed by an international Certificate of Guarantee.