Opal Price & Value: What an Opal Costs and Why
Opal is priced differently to almost every other gemstone: carat weight matters far less than colour. A one-carat black opal with vivid red flashes can be worth many times a one-carat white opal with dull blue — same weight, wildly different value. This guide explains what actually drives opal prices in Australia, what you can expect to pay, and why Created Opal costs a fraction of natural.
Why opal doesn't price like other gems
With sapphire or ruby, you can reason from the four Cs and land near a number. Opal doesn't work that way. Two stones can be identical in size, cut and clarity and differ tenfold in price, because opal's value lives almost entirely in the quality of its play-of-colour — something that resists tidy measurement.
That makes opal harder to price at a glance, but the logic isn't mysterious once you know what valuers look at.
The six factors that drive opal price
1. Body tone — the biggest single factor
Body tone is the background colour behind the flashes. Black opal is by far the most valuable, because a dark background makes colour appear more vivid. White opal, with its pale milky body, shows the same colours more softly — and prices accordingly. Boulder opal sits between the two, its dark ironstone backing lending it some of black opal's intensity.
2. Brightness
How strongly does the colour actually flash? Australian valuers commonly grade brightness on a scale from subdued to brilliant. A brilliant stone can be worth several times a dull one with otherwise identical characteristics. Brightness is the first thing to check when you're looking at an opal.
3. Colour range
Not all flash colours are equal. Red is the rarest and most valuable, followed by orange. Green sits in the middle. Blue is the most common and the least expensive. A stone that shows red across a broad area sits at the top of the market; a purely blue-green stone sits far below it.
4. Pattern
Broad, distinct patches of colour — what the trade calls harlequin or broad flash — are prized well above fine, speckled pinfire. Pattern is subjective to a degree, but the market consistently rewards boldness and clear definition.
5. Solid, doublet or triplet
A solid opal is a single piece of stone. A doublet is a thin slice of opal bonded to a dark backing to imitate black opal's contrast. A triplet adds a clear cap on top of that. Solids command by far the highest prices; doublets and triplets are considerably cheaper and should always be disclosed as such.
6. Cut and size
Weight matters, but far less than in other gems. A well-cut cabochon with a good dome shows colour better than a flat one, and cutting to preserve colour often matters more than cutting to maximise carat weight.
What natural opal costs in Australia
Ranges are broad, and any figure is indicative rather than a quote — opal genuinely does defy neat pricing. As a general guide, white opal with modest colour sits at the accessible end of the natural market. Boulder opal rises from there. Black opal from Lightning Ridge occupies the top, and fine black opal with strong red play is among the most expensive gem material on earth by weight — genuinely competitive with high-quality sapphire.
Two stones described identically on paper can differ enormously in price, which is precisely why photographs and in-person viewing matter so much more with opal than with other gems.
Created Opal: the same look, a fraction of the price
Most Irosk opal is Created Opal — grown under controlled conditions rather than mined. It's built the way nature builds it, from silica spheres in an ordered grid, and it shows the same characteristic play-of-colour.
The price gap is the point. Fine natural opal, particularly black opal, is expensive. Created Opal makes the look reachable, and it brings two practical advantages: consistency, which matters enormously in a bracelet or a pair of earrings where several stones sit side by side and must match, and availability, since a specific colour and size can be produced rather than hunted for.
Selected Irosk pieces use natural opal, and where that's the case the product title or description says so. We name the stone accurately on every product, always.
Is opal a good investment?
Buy opal because you want to wear it. Gemstones are not a straightforward investment: retail prices carry margin, resale markets are thin, and valuation is subjective — especially so with opal, where two experts can reasonably disagree. Choose a stone whose colour you love, in a setting you'll actually wear, at a price you're comfortable with. That's the sound basis for buying opal.
Shopping for opal jewellery
Browse our opal jewellery collection in 925 sterling silver, or shop by style: opal rings, opal earrings, opal necklaces and opal bracelets. For an October birthday, start with October birthstone jewellery. Our complete guide to opal covers the stone in full.
Frequently asked questions
Why is black opal so much more expensive than white opal?
Because colour reads more strongly against a dark background. Black opal's dark body tone makes its play-of-colour appear far more vivid than the same colours would look against white opal's pale, milky body. Since opal is valued almost entirely on the quality of its colour display, that contrast translates directly into price.
What is the most valuable colour in an opal?
Red. It's the rarest flash colour and commands the highest premium, followed by orange. Green sits in the middle, and blue — the most common — is the least expensive. A stone showing broad red flashes against a black body tone sits at the very top of the opal market.
How much cheaper is Created Opal than natural opal?
Considerably. Fine natural opal, particularly black opal, is genuinely expensive gem material, while Created Opal costs a fraction of that. It shows the same play-of-colour and offers better consistency between stones, which is why it suits pieces where several opals must match, such as bracelets and pairs of earrings.
Written by the Irosk team. Irosk is a family-owned Australian jewellery brand based in Brisbane, specialising in 925 sterling silver gemstone jewellery. We've been crafting birthstone pieces since 2021.
