Having an Opal Valued: What Your Stone Is Really Worth
Opal knowledge · Establishing value
The stone from the drawer
Having an opal valued is the moment when an heirloom turns into either a disappointment or a surprise. Unlike gold, opal has no daily rate and no formula. Two stones of the same size can differ in value by a factor of fifty. Here is what you can judge yourself, when an appraisal is worth it and how to recognise a reputable buyer.
What the value rests on: The value rests on body tone, liveliness of the play of colour, the share of colours and the construction. A dark stone with strong red is worth many times a pale one with washed out blue. For insurance or a sale you need a written appraisal; a shop's buying estimate is no substitute.
What can you judge yourself?
You can check four things without any equipment. They decide the greater part of the value.
| Feature | Raises the value | Lowers the value |
|---|---|---|
| Body tone | dark to black | pale, milky |
| Play of colour | strong, across the whole surface | washed out, visible from one angle only |
| Colours | red and orange present | blue only |
| Construction | solid opal | doublet or triplet |
The single most important factor is body tone, because it amplifies all the others: the same colour looks many times stronger on a dark base. Details in how much is an opal worth and opal colours at a glance.
Check the construction first
Before you think about value: look at the side edge. A dead straight line means a doublet or triplet, in other words glued layers. Such stones are worth considerably less than solid opals and usually cannot be reset either. How to spot this reliably is in doublet and triplet.
Which price ranges are realistic?
There is no opal exchange rate. The figures below are a trade guide for loose solid opals, as of 2026, not an offer to buy your stone and not an insurance value. They are meant to stop you from mistaking a doublet for a Lightning Ridge stone, or a light crystal opal for something worthless.
| Type | Typical features | Guide |
|---|---|---|
| Doublet / triplet | layered, straight edge | often under €50 per stone, rarely over €200 |
| Light white or crystal opal | lively fire, solid opal | roughly €20 to €300 per carat |
| Boulder opal | ironstone stays on the stone | wide range, often €50 to €800 per stone rather than per carat |
| Welo, hydrophane | lots of fire, volcanic | below Australian crystal opal of the same look |
| Black opal, Lightning Ridge | dark base, red in the play | often €500 to over €10,000 per carat at the top end |
A 2-carat white opal with pale blue can be under 80 euros. A 2-carat black opal with red can reach five-figure sums. That is why "my opal is 3 carats" is not a statement of value. Body tone, share of red, pattern and construction are what move the needle. Antique settings have their own metal value, which does not automatically raise the value of the stone. Cracks, dull polish and discoloured doublet glue push the value down sharply.
The twelve factors in detail are in How Much Is an Opal Worth?. The table here is the short version for the drawer.
How does an appraisal work?
A reputable process has steps. Anyone who names a price on the phone without having seen the stone is selling you an anchor, not an appraisal.
Document
Photograph the front, the back and the side edge in daylight. Weigh the stone if it is loose, or note the dimensions of the setting. Write down what you know about its origin, even if it is only "from grandmother, around 1970".
The right place to go
For an appraisal report: a gemologist or a gemological lab, not the buyer around the corner. For a selling price: two dealer offers, in writing. The same person should not mix appraisal and purchase in one breath.
Hand in or present
Many labs accept the stone against a receipt. You get a number, not a verbal "it is surely worth a lot". Ship only insured and documented. Do not leave the stone in a shop without a receipt.
The report
A useful document states the construction (solid opal, doublet, triplet), body tone, weight or dimensions, play of colour, origin as far as it can be determined, treatments and a value with a date plus its purpose (insurance or replacement). If the purpose is missing, the figure cannot be interpreted.
Cost and time
Identification alone is often in the low three-digit range. A reasoned valuation costs more. Small light stones and recognisable doublets are rarely worth it. Time: days to a few weeks, not ten minutes at the counter.
We do not buy stones and do not write appraisals. The process above is the standard against which you can measure offers. In Germany, gemological labs and appraisers trained by the DGemG are the usual address, while jewellers buying for cash are a different market. For household contents insurance, what counts is replacement at today's trade price, not what a buyer pays you in cash. Inheritance and the division of assets need the same document with a date, otherwise the tax office works with fantasy figures or with zero.
When is an appraisal worth it?
Worth it
For heirlooms of unknown origin, for dark stones with strong fire, before a sale and for household insurance.
Usually not worth it
For small pale stones from costume jewellery and for obvious doublets. Here the cost of the appraisal often exceeds the value.
A sound appraisal always states: construction, body tone, measurements and weight, a description of the play of colour, any indications of treatment, and a reasoned value with a date. If one of these is missing, it is an opinion, not an appraisal.
Estimated value or buying price: which applies?
Three figures that are regularly confused and lie far apart.
Insurance value
What an equivalent replacement would cost in the trade. The highest of the three figures.
Market value
What a private buyer realistically pays. Sits well below the insurance value.
Buying price
What a dealer offers. He has to resell the stone, so this price sits lower again.
How do you recognise a reputable buyer?
He explains the price
A reputable buyer tells you why: body tone, play of colour, construction. Anyone who only names a figure has something to hide.
He gives you time
Pressure is the most common warning sign. A genuine stone does not lose value if you sleep on it for a night.
He puts it in writing
A description of the stone and the offer on paper. Verbal promises are worthless later.
You get a second offer
Because opal has no daily rate, offers vary more than they do for gold. Two opinions are the minimum.
Please note: We do not buy stones and we do not issue appraisals. If you want to know what good quality looks like, comparison helps: our range shows how play of colour and body tone look on checked stones.
What to do before the first offer
Get at least two assessments before you sell, and have each one put in writing. Photograph the stone from both sides in daylight beforehand. If someone quotes you a price over the phone without having seen the stone, that is not an offer but an anchor. And never hand over your stone before you have made up your mind.
Common questions about establishing value
How do I have an opal valued?
Through a gemmologist or a gemstone laboratory. A sound appraisal describes construction, body tone, measurements, weight, play of colour and possible treatments, and gives a reasoned value with a date.
What does an opal appraisal cost?
That depends on the effort involved and on the provider. For small pale stones the cost often exceeds the value of the stone, so it is usually not worth it.
Why does a dealer offer less than the estimated value?
Because insurance value, market value and buying price are three different figures. The dealer has to resell the stone and factors in his margin.
Can I estimate the value myself?
Roughly yes. You can judge body tone, liveliness, the share of colours and the construction without equipment, and they make up the greater part of the value.
Is an old opal worth more?
Not automatically. Age alone does not raise the value; the quality of the stone remains decisive.
Does an opal lose value over time?
Not through age, but through condition. Scratches, dulled surfaces and, in doublets, moisture that has seeped in reduce the value considerably.
If you are unsure or have questions, you are welcome to contact us at any time, even if you did not buy the opal from us. Contact form, email cs@libertyangels.de or call +49 171 1603048.
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Written by Anton Kehler
Founder of FAERELLI & Liberty Angels
