Mexter Biz Listings

Opal Diamond Factory

Established in 1974, Opal Diamond Factory is Adelaide’s oldest and largest opal, diamond and coloured gem specialist.


Opal Diamond Factory


32-34 King William St,Adelaide SA 5000
Adelaide SA 5000



Our collection of South Australian crystal and white opals, Queensland boulder opals and famous Lightning Ridge black opals is the most extensive in Australia.

John Rynes, an opal pioneer, and Mike Saj-Rynes, a son, discovered a love of Australia's national gem in the red dust of Coober Pedy, South Australia's far north.

At the Opal Diamond Factory, the Rynes family crafts jewellery, including bespoke pieces, from opals, ethically-sourced GIA certified diamonds and other precious stones.

We are proud to have played small parts in thousands of stories - from love celebrations and special moments, to the creation of keepsakes and treasured gifts. Collaboration with our customers is the core of what we do.

Our success is the result of passion and hard work; whether it be cutting rough opals straight from the mine, or shaping elegant, custom jewellery in our design studio.

We invite you to visit our Adelaide showroom or to make your custom order.


About Adelaide

Adelaide ( (listen) AD-il-ayd) is the capital city of South Australia, the state's largest city and the fifth-most populous city of Australia. "Adelaide" may refer to either Greater Adelaide (including the Adelaide Hills) or the Adelaide city centre. The demonym Adelaidean is used to denote the city and the residents of Adelaide. The Traditional Owners of the Adelaide region are the Kaurna people. The area of the city centre is called Tarndanya in the Kaurna language.Adelaide is situated on the Adelaide Plains north of the Fleurieu Peninsula, between the Gulf St Vincent in the west and the Mount Lofty Ranges in the east.



Client Reviews

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Tim Longstaff

opal jewellery

If you are reading these reviews in the hopes of finding a dream piece of jewellery (especially an engagement ring) then your search is complete. Out of all the locations I went to searching for an engagement ring, this was head and shoulders above the rest. A daunting process was made not only easy but enjoyable by the lovely people at The Opal Diamond Factory. They are caring, helpful and above all know what they are talking about. The whole process was made easy by Mike; from the sizing to the style, the stone itself and overall design features, anything seemed possible. I cannot praise this man and his skill enough; the care he puts into understanding what you want the design to say and the jewellery itself is amazing. As for the jewellery itself, it is nothing short of breathtaking. His ability to frame the centerpiece stone while also making the band stand out is phenomenal. For me this involved engraving the engagement band to make it appear as though it was a branch supporting an opal. The detail he was able to achieve with this was amazing. Not only this, but the quality of the opal and the range of choices and styles available will mean that there will definitely be something that catches your eye as ‘the one’. If you are like I was and are searching the internet in the hopes of finding something special, then you have found the location you are looking for. Stop reading this and ring, email or go to the store, you will not be disappointed by the service, care or heart stopping potential that their jewellery has.

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Robyn Habel

opal ring

Wonderful customer service! LGBT friendly - the whole family made me feel very welcome and accepted. The engagement ring was literally perfect, and my Fiancée loves it! I designed the ring and Mike was amazing helping me through the various stages of the ring

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Emma Mcdonald

custom designed opal ring

From my very first experience at ODF as a child, going into the shop just to browse the beautiful gems with my Mum, they have been nothing short of amazing. I have since bought multiple pieces for my family, all custom designed by Mike. I have been over the moon with every single piece. Mike

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