How to Spot a Genuine Australian Opal

Australia is home to over 90% of the world’s opal supply, and its gems are unmatched in quality and brilliance. But with opals in high demand, the market has seen a surge in synthetic and imitation stones.

At Iona Opal Australia, we’re committed to authenticity—so here’s how you can spot a genuine Australian opal and avoid being caught out.

Check the Origin

Authentic Australian opals are mined from renowned fields like Coober Pedy, Lightning Ridge, and Andamooka. A reputable seller will always state the origin. If it’s vague or absent, be cautious.

Understand the Types of Opals

Solid opals are natural and consist of one piece. Doublets and triplets, on the other hand, are layered and often use a thin opal slice glued to a backing. While still technically using real opal, they’re less valuable and more prone to damage.

Look for Natural Imperfections

Genuine opals often have slight inclusions or irregularities. If a stone looks too flawless, it may be synthetic. Similarly, if the play-of-colour appears uniform or “too perfect,” it’s worth questioning.

Test the Transparency and Colour Play

Natural opals show a dynamic play-of-colour that shifts in different lighting. Synthetic versions can appear dull, flat, or overly glossy. Hold the stone under various lights—real opals dance with colour.

Ask About Treatments

Avoid opals that have been heavily treated or dyed to enhance colour. Reputable sellers like Iona Opal Australia will always disclose any treatments.

Buy from Trusted Sources

The best way to ensure authenticity is to buy from reputable, transparent sellers. At Iona Opal Australia, every opal is solid, natural, and ethically sourced from Australian mines—and we’re proud to be a verified seller and member of the Opal Association of Australia.

Whether you’re new to opals or a seasoned collector, understanding what to look for will help you buy with confidence. Visit ionaopal.com.au to explore our authentic Australian opals and bespoke jewellery.