Opal — Australia's National Gemstone

Opal is Australia's national gemstone — and Australia produces approximately 95% of the world's supply of fine precious opal. From the legendary black opals of Lightning Ridge to the crystal opals of Coober Pedy and the boulder opals of Queensland, Australian opal is celebrated worldwide for displaying the most extraordinary play of colour of any gemstone on earth.

At Diamond Imports, Daniel personally sources natural Australian opals — for engagement rings, dress rings, pendants, earrings, and bespoke commissions across Sydney and Australia-wide.

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What Is an Opal?

Opal is a hydrated form of silica that forms over millions of years as silica-rich water seeps through cracks and cavities in rock and slowly evaporates, leaving behind tiny spheres of silica arranged in a precise lattice. When light enters this lattice, it diffracts and breaks into the spectral colours we see flashing across the stone's surface — the famous "play of colour" that makes opal unique among gemstones.

No two opals are ever identical. Every opal is a one-of-a-kind natural artwork, with its own unique pattern, dominant colours, and personality.

Opal ranks 5.5 to 6.5 on the Mohs hardness scale — softer than diamond, ruby, sapphire, and emerald. Opal also contains 6–10% water by weight, which means it requires more thoughtful care than harder gemstones. With the right care, however, opal will last generations — many fine Victorian-era opals are still being worn today.

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Types of Australian Opal

Australian opal is classified primarily by its body tone — the background colour against which the play of colour is displayed. Body tone is the single most important factor in opal value, with darker body tones generally producing more vivid and dramatic play of colour.

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Famous Australian Opal Fields

Lightning Ridge, New South Wales

The world's most important source of black opal. Discovered in the late 1800s, the Lightning Ridge fields have produced virtually every legendary black opal in existence. The opal here forms in claystone seams and is mined predominantly by small-scale miners who have shaped the unique culture of the town. A genuine Lightning Ridge black opal is among the most coveted gemstones on earth.

Coober Pedy, South Australia

The largest opal-producing area in the world by volume. Coober Pedy produces predominantly white opal and crystal opal, with the town itself famously housing many of its residents underground in dugouts to escape the desert heat. Coober Pedy material has been the foundation of the global commercial opal trade for over a century.

Queensland — Winton, Quilpie, Yowah, Koroit

Queensland's opal fields produce the world's supply of boulder opal — found nowhere else in significant commercial quantities. Each field has its own character: Winton material often shows bold play of colour on dark ironstone, Yowah produces the famous Yowah Nuts, and Koroit yields opal with extraordinary matrix patterns.

Mintabie & Andamooka, South Australia

Important secondary sources producing crystal opal (Mintabie) and the unique matrix opal (Andamooka). Both have produced museum-grade specimens.

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How Opals Are Graded

Opal grading is more subjective than diamond grading — there is no universal certificate equivalent to a GIA diamond report. The value of any individual opal is determined by a combination of factors that an experienced gemmologist's eye is best equipped to assess.

Body Tone

The colour of the background against which the play of colour is displayed. Graded from N1 (jet black) through to N9 (pure white). Black opals (N1–N4) command the highest premiums, followed by dark, then light, then white. Body tone influences how vivid the play of colour appears.

Play of Colour — Brilliance, Pattern, and Colour Range

The most important factor after body tone. Three elements are assessed:

• Brilliance — how bright and "alive" the play of colour appears. Top stones look electric and almost lit from within.
• Colour range — the spectrum of colours visible. Red is the rarest and most valuable, followed by orange, yellow, green, and blue. A stone showing all spectral colours, particularly with strong red, commands premiums.
• Pattern — the arrangement of colour across the stone. Named patterns include harlequin (rare, geometric blocks), flagstone, pinfire, rolling flash, broad flash, and many others. Rare patterns add significantly to value.

Directionality

A top opal shows its play of colour from all viewing angles. Stones with "directional fire" — colour visible only from one angle — are less valuable than those with vivid colour from all directions.

Carat & Shape

Opal is cut predominantly as cabochons (smooth domed shape) to display play of colour, though faceted opals exist for some translucent material. Large fine opals are rare and increasingly so as productive seams are worked out. Boulder opals are typically cut as free-form (non-standard) shapes to preserve the maximum opal area.

Origin

For significant opals, origin is a meaningful value factor. A Lightning Ridge origin certificate is particularly valuable for black opal, while Queensland origin certificates carry weight for boulder opal.

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Solid, Doublet, Triplet — A Quick Explainer

For complete buyer transparency, it's worth knowing the three main forms in which opal is sold:

• Solid opal — a single piece of natural opal, cut and polished. The most valuable and the only form considered "fine jewellery grade." All opals at Diamond Imports are solid natural opals unless explicitly described otherwise.
• Doublet — a thin slice of natural opal bonded to a dark backing (typically ironstone, black potch, or vulcanite) to enhance the appearance of play of colour. Doublets offer the opal look at lower cost.
• Triplet — a doublet with an additional clear quartz or glass cap on top for protection. Affordable and durable, but with reduced visual depth compared to solid opal.

Doublets and triplets are perfectly legitimate products at the right price — the key is that they should always be clearly disclosed. At Diamond Imports we stock solid natural opal as standard.

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Opal Engagement Rings

Opal engagement rings have surged in popularity in recent years — driven by a desire for something distinctively beautiful, deeply personal, and authentically Australian. There's a long tradition of opal engagement rings in Australia, and a fine opal is one of the most expressive choices possible.

Practical considerations when choosing an opal engagement ring:

• Protective settings matter — opal is softer than diamond and most coloured gemstones. Bezel settings, halo settings, and lower-profile settings protect the stone from impact and snagging. High four-prong solitaires are best avoided.
• Boulder opal works well for everyday wear — the natural ironstone backing adds protection and the irregular shape gives the ring genuine character.
• Match the ring to the lifestyle — opal is a wonderful choice for those who appreciate its character and are happy to give it reasonable care. It's not ideal for someone seeking a "wear and forget" ring or working with their hands all day.
• The play of colour evolves — many opal owners describe the way the stone seems to change with the light, mood, and occasion. No diamond does this.

Daniel will help you select the right opal — body tone, pattern, colour range, and shape — for your design and lifestyle.

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Caring for Your Opal

Opal contains water, and a small amount of awareness goes a long way to keeping it beautiful for generations.

• Clean gently — a soft cloth and lukewarm water with a tiny amount of mild soap. Rinse and pat dry gently.
• Never use ultrasonic or steam cleaners — the vibrations and heat can damage the stone or affect its water content.
• Avoid prolonged dry heat — don't leave opal jewellery in direct sunlight for long periods, in a hot car, or near a heat source. Sudden temperature changes can stress the stone.
• Avoid harsh chemicals — household cleaners, hair products, perfume, and chlorinated water should be kept away from opal. Apply perfume and lotions before putting on opal jewellery.
• Avoid impacts — opal is softer than harder gemstones. Remove opal rings during sport, gardening, and heavy manual tasks.
• Store separately — opal scratches easily when stored next to diamond, sapphire, or ruby. Use a soft pouch or its own compartment.
• Annual professional check — have the setting and stone inspected once a year.

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Opal Symbolism and History

Opal is the October birthstone and the traditional gift for the 14th wedding anniversary. The Romans considered opal the most precious of all gemstones — believing it combined the beauty of every other gem because of its play of colour. The name "opal" likely comes from the Sanskrit upala, meaning "precious stone," via the Greek opallios. In Australia, opal carries enormous cultural significance: it was named our national gemstone in 1993 and remains one of Australia's most internationally celebrated natural treasures.

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