The Australian Opal and Diamond Collection

Family owned and operated for over 30 years.

The Australian Opal and Diamond Collection is proudly a family owned and operated business in Adelaide, Australia. Since 1980, Joe and Sylvia Dimasi have been committed to showcasing the beauty of Australian Opals to the world.

The Australian Opal and Diamond Collection (AODC) is one of Australia's leading Opal merchants. We are Wholesalers, Exporters and manufacturing Jewellers of Australian Opal Gemstones. We have an extensive range of Australian Opal Jewellery, including the rare and prized Black Opal.

We feel that the individuality, quality and authenticity of our merchandise can never be compromised. That our commitment and professional attitude towards customer service and client relations make us stand out from the rest. We also pride ourselves on the ability to provide a high-class product at a reasonable price. The Australian Opal Collection is involved in all facets of opal; from mining to export. We are therefore able to offer a fine and extensive range of unique opal jewellery pieces that you cannot find anywhere else.

Natural, Australian Opal Jewellery

The Australian Opal and Diamond Collection are committed to offering our customers 100% natural Australian opals. We never use colour treated or synthetic opals. Our opal jewellery is handcrafted in Adelaide by our experienced jewellers. Each piece is carefully designed and created to celebrate the unique beauty of each opal piece.

Shop Opals

Australian Opal in Service to Royalty

The Australian Opal and Diamond Collection has manufactured and designed pieces for several Monarchs around the globe, includng HRH Princess Mary of Denmark and HM Queen Sylvia of Sweden.


Sylvia Dimasi, Chief Designer at The Australian Opal & Diamond Collection was also approached to design a unique piece for Princes Mary to celebrate the birth of her son, Prince Christian. This spectacular piece consisted of a Solid Crystal Opal from Mintabie, South Australia, surrounded in diamonds. This particular piece of jewellery converts into three different pieces; a pendant, ring and a brooch.

AODC Representing Australia

AODC was recognised by the Australian Federal Government, as being the leader in our industry. We have represented Australia at the 2005 World Expo in Aiichi, Japan; as well as the 2010 World Expo in Shanghai, China. The AODC has showcased our range of Autralian Opals, Diamonds and Pearl Jewellery to over 8 million guests, who came from all over the world to view and purchase our exclusive pieces.

We have been commissioned by the Federal Government of Australia and state Government of South Australia to design and hand craft unique Australian Opal jewellery for different International heads of State. We have also received invitations to host VIP viewings. These include clients such as; Mr. Donald Rumsfeld, The King and Queen of Sweden and numerous celebrities from the entertainment world.

The AODC Guarantee

We only use 100% natural, Australian Opals in our Opal jewellery. We never use colour treated or synthetic opals. A certificate of Authenticity and Valuation is provided with every opal jewellery purchase. This includes a digital image of the piece scanned on to the document, which is then signed by our licensed valuer. All AODC diamonds are Conflict Free. 

AODC are proud members of:
- The Australian Opal and Gem Industry Association
- Gemological Association of Australia
- Jewellers Association of Australia Ltd.
- South Australia Opal Miners Association
- Adelaide Convention and Tourism Authority
- Founding Member of The Australian Opal Exchange
- Cruise Down Under