Turquoise: Natural, Stabilized, Reconstituted or Fake?
Turquoise is the stone people most often buy without knowing what they bought. Two bracelets can sit side by side in a window, the same blue and the same size, and one is mined stone worth several hundred dollars while the other is dyed white rock that never contained a speck of turquoise. December's birthstone has more treated and imitation material in circulation than almost anything else we handle. Here is how to tell the categories apart and how to care for the real thing.
Everything starts with porosity
Turquoise forms when copper-rich groundwater seeps down through rock and reacts with minerals containing phosphorus and aluminium. It grows as a mass of microscopic crystals rather than a single clear crystal, and the spaces between those crystals are what make turquoise what it is.
GIA explains that when the crystals are packed closely, the stone has low porosity and a fine texture, and it takes an attractive, waxy luster when it's polished. When the crystals sit further apart, the stone is more porous and coarser, and it polishes to a dull finish. That single difference drives the price, the treatments, the care rules, and the reason the fakes exist.
Porous means absorbent: an untreated porous stone takes in water, oil, lotion and sweat, and holds them. It also means weak, because there is less solid material holding the stone together. GIA rates turquoise at 5 to 6 on the Mohs scale with fine-textured material showing fair to good toughness and coarse material showing poor toughness. Most mined turquoise falls on the porous end. Left alone it would crumble on the saw before reaching a setting.
The five things sold as turquoise
These categories carry different prices and different honesty requirements. Learn them once and you will never be confused at a counter again.
1. Natural, untreated turquoise
Mined stone, cut and polished, with nothing added. Only a small fraction of what comes out of the ground is hard and dense enough to be used this way, which is why untreated gem-quality material commands a premium over everything else here. It is also the category that changes over time, because the pores are still open and still absorbing. Buy it knowing that.
2. Stabilized turquoise
Mined stone with clear resin or polymer forced into its pores under pressure. The stone becomes harder, holds a better polish, shows deeper colour, and stops absorbing oils. This is the majority of what is sold worldwide, and it is a legitimate product when the seller says so. The Canadian Jewellers Association names stabilizing directly in its list of treatments that must be disclosed, requiring that the word treated or enhanced or the type of treatment method or process must immediately precede the correct gemstone name. A stabilized stone described as stabilized is a good buy. The same stone sold as untreated is fraud.
3. Waxed or oiled turquoise
An older and lighter treatment. Wax or oil is worked into the surface to darken the colour and add shine. It improves appearance without adding much strength, and it wears off, so the stone can look duller a few years on. Because it does not last, it sits squarely inside the disclosure rules covering treatments that are unstable or impermanent in normal wear.
4. Reconstituted or "block" turquoise
Turquoise powder and small fragments mixed with resin, compressed into a block, and cut into shapes. Real turquoise is in there. The stone you are holding was assembled rather than mined in that form. Canadian guidelines define this as an artificial substance manufactured by melting, bonding or fusing particles or fragments of the named material to form a coherent whole, and give "reconstituted turquoise" as the example of how it must be labelled. It is the cheapest material with any turquoise content, and it is everywhere in low-cost beaded jewellery.
5. Imitation: dyed howlite, dyed magnesite, and plastic
No turquoise at all. Howlite and magnesite are white minerals with natural grey veining that accept blue dye, and once dyed they look convincing to an untrained eye. Plastic and resin castings sit at the bottom. Under Canadian guidelines, none of these may be called turquoise unless the words artificial, imitation or simulated precede the gemstone name with equal prominence. In practice they get sold as "genuine turquoise" constantly, because "genuine" is a word with no fixed meaning.
| Category | Contains mined turquoise | What was done to it | Durability in wear | Correct wording on a receipt |
|---|---|---|---|---|
| Natural, untreated | Yes, whole stone | Cut and polished only | Hardest material, but colour shifts with oils and cosmetics | Turquoise |
| Stabilized | Yes, whole stone | Resin or polymer forced into the pores | Good, resists oils and lotion | Stabilized turquoise |
| Waxed or oiled | Yes, whole stone | Wax or oil worked into the surface | Appearance fades as the treatment wears off | Treated turquoise, wax or oil named |
| Reconstituted or block | Yes, as powder and fragments | Ground, mixed with resin, pressed into a block | Holds together, but chips reveal the binder | Reconstituted turquoise |
| Dyed howlite or magnesite | No | White mineral soaked in blue dye | Dye can fade or rub off at wear points | Imitation or simulated turquoise |
| Plastic or resin | No | Moulded and coloured | Scratches readily, warm to the touch | Imitation turquoise |
Why the colour runs from sky blue to green
Copper is part of the chemical formula of turquoise, and copper is what makes it blue. Iron is what pushes it green. Research published in Royal Society Open Science in 2021 found that Fe3+ contributes to green hue of turquoise, with iron substituting into the structure in place of aluminium and shifting the colour away from blue as its content rises.
So a green turquoise is an iron-rich turquoise, the same mineral formed in ground with a different chemistry. GIA describes the general range as light to medium blue or greenish blue, with the most prized colour being an even, intense, medium blue. Price follows that preference. Our own view is that a good green turquoise in silver looks better on more people than a pale washed-out blue does, and it costs less.
Matrix: the veins running through the stone
Matrix is the host rock the turquoise grew inside, left behind as veins and patches in the finished stone. GIA notes that limonite creates dark brown markings in turquoise, while sandstone creates tan markings. When those seams are fine and form web-like patterns across the face of a stone, the result is called spiderweb turquoise.
Treat matrix as taste. The traditional pricing standard puts clean, even blue at the top, and GIA reflects that. Yet spiderweb material with a tight web sells to collectors above plain stone of the same colour. We stock both and say the same thing to everyone: pick the one you want to see on your wrist, and ignore what a chart says it should be worth.
How to buy without getting caught
Four habits will protect you almost completely.
Ask what treatment the stone has had, then ask for it in writing. This is the whole game. A receipt reading "stabilized turquoise, sterling silver" is a document. A verbal "it's genuine" is nothing. Canadian guidelines put the duty on the seller, stating that the vendor must be prepared to provide to the purchaser, information regarding any treatment that may have been applied to the substance offered for sale. The American rule runs the same way. The US Federal Trade Commission tells sellers that if the treatment requires special care, you should tell the consumer, and that a treatment must be disclosed if it affects the value of the stone.
Read the price against the size. A 25mm cabochon of clean untreated blue turquoise is a scarce object. Offered for $40, it is telling you it is block material or dyed howlite. Price far below the market for the size is the most reliable signal a buyer has.
Test the claims carefully, and let a jeweller do the real testing. Home tests circulate online, and most of them damage the stone. The hot needle test melts plastic to prove a point, and it will also scar stabilized turquoise, which is resin-bearing. The acetone test lifts dye from howlite, and it can also strip wax or dull a treated surface. A jeweller can separate treated and imitation material with magnification, examination of the drill holes and edges, and specific gravity, without harming a stone you may want to keep. Gemmological laboratories go further still. A 2022 GIA study of a new silicate-based treatment found that infrared and UV-Vis absorption spectra characteristics are basically the same for untreated and porcelain-treated turquoise and therefore not useful for separation, which shows how fast the treatment side moves and why laboratory equipment keeps having to catch up.
Buy from someone who discloses before you ask. The seller who volunteers "this one is stabilized, here is the price difference" is the seller you want. Disclosure is a habit, and a shop that has it applies it to everything on the shelf.
Caring for turquoise
The care rules follow from porosity, and GIA's guidance is short and firm. Clean with warm, soapy water, but never with steam or ultrasonic cleaners. Turquoise is generally stable to light, though high heat can cause discolouration and surface damage, and heat or solvents can damage treated surfaces.
The practical version is four moments to take it off for. Before swimming, because chlorine and salt water both attack it. Before cleaning the house, because bleach and ammonia are solvents. Before lotion or sunscreen. Before perfume and hairspray. Those four cause most of the damage we see on turquoise, and all four are avoidable.
Store turquoise away from sunlight and heat, in a soft pouch or a lined box where harder stones cannot reach it. Anything above a 6 on the Mohs scale will scratch it, which means nearly everything else in the box. Our guides to storing jewellery properly and care by gemstone hardness go into the storage and hardness questions in more depth.
Silver and turquoise
Silver is the traditional setting metal for turquoise and it earns the position. Bezel setting, where a thin collar of metal is pushed over the edge of the stone by hand, suits a soft stone far better than prongs do, because it spreads pressure around the whole edge and shields it from knocks. Cool grey-white metal also flatters blue in a way yellow gold does not always manage.
Silver darkens over time, and turquoise limits how you can deal with that. Commercial silver dips are solvents, and a solvent near a treated turquoise is a problem. Polish the metal with a dry silver cloth, keeping it off the stone, and bring the piece to us for anything more. Our article on cleaning sterling silver and slowing tarnish covers the safe methods, and December is one of the entries in our month-by-month birthstone guide.
Turquoise-friendly silver from our cases
These are sterling silver pieces from our Coquitlam studio. Silver is the metal we set most turquoise into, and these show the styles that suit a bezel-set stone.
Key Takeaways
- GIA rates turquoise at 5 to 6 on the Mohs scale with fair to good toughness, so it belongs in pendants and earrings more than in a ring worn every day.
- Stabilized turquoise is mined stone with resin in its pores. It is the majority of the market and a fair purchase whenever the seller discloses it.
- Reconstituted or "block" turquoise is powder bound with resin, and dyed howlite or magnesite contains no turquoise at all. Canadian guidelines require both to be labelled as such.
- Copper makes turquoise blue and iron pushes it green. Matrix is host rock left in the stone, and whether you want it is a question of taste rather than quality.
- Clean turquoise with warm soapy water only. Steam, ultrasonic machines, chlorine, bleach, lotion and perfume are the things that ruin it.
Frequently Asked Questions
Is stabilized turquoise real turquoise?
Yes. Stabilized turquoise is mined turquoise that has had clear resin or polymer pushed into its pores under pressure, which hardens the stone and deepens the colour. The mineral is still turquoise. Nothing was swapped out. What changed is that the pores are now filled, so the stone cuts cleanly, takes a polish, and stops drinking up hand cream and skin oil. Most of the turquoise sold anywhere in the world has been stabilized, because most mined material is too soft and too porous to set in a ring otherwise. GIA notes that coarse, porous stones are usually treated to make them smoother, shinier, and more marketable. The one thing that matters is disclosure. A seller should tell you the stone is stabilized and write it on your receipt. A stabilized stone honestly described is a fair purchase at a fair price.
What is the difference between stabilized and reconstituted turquoise?
Stabilized turquoise starts as one solid piece of mined turquoise and stays one solid piece. Resin goes into the pores of that piece. Reconstituted turquoise starts as turquoise powder and fragments, which are bound together with resin and pressed into a block, then sawn into shapes. The Canadian Jewellers Association defines reconstituted material as an artificial substance manufactured by melting, bonding or fusing particles or fragments of the named material, and uses "reconstituted turquoise" as its own worked example of correct wording. So the two sit in different categories and carry different prices. Reconstituted material often gives itself away by looking too perfect: even colour across every bead in a strand, matrix that repeats, and a lightness in the hand. Ask which of the two you are being offered, and ask for the answer in writing.
How can I tell if turquoise is dyed howlite?
Howlite is a white mineral with grey or black veining that soaks up dye readily, so it is dyed blue and sold as turquoise more than any other substitute. Magnesite gets the same treatment. Look at the veining first. Turquoise matrix is the leftover host rock the turquoise grew in, so it sits at its own depth and the pattern wanders. Dyed howlite veining often looks like ink that ran along a surface crack, darker where it pooled and sitting on top rather than inside. Check the price against the size, because a large evenly blue piece for a small sum is telling you something. Then hand it to a jeweller. We can separate dyed howlite from turquoise at the bench in minutes using magnification and a look at the drill holes, where undyed white material often shows through on an imitation.
Can turquoise be cleaned in an ultrasonic cleaner?
No, and this is the mistake we see most often. GIA states plainly that it is safe to clean turquoise jewellery with warm, soapy water, but it should never be cleaned with steam or ultrasonic cleaners. An ultrasonic machine drives vibration through liquid into every pore and crack in a stone, and turquoise is built out of pores. Steam adds heat, and GIA warns that heat or solvents can damage treated surfaces and that high heat can cause discolouration and surface damage. Use a bowl of warm water with a drop of dish soap, a soft toothbrush, then rinse and pat dry with a soft cloth. If a piece needs more than that, bring it to us. We clean turquoise by hand, and we ask first whether a stone has been stabilized, because that changes what we can safely use on it.
Why does turquoise change colour over time?
Because untreated turquoise is porous and absorbs what touches it. GIA lists the causes directly: turquoise can be discoloured by chemicals, cosmetics, and even skin oils or perspiration. Hand lotion, sunscreen, perfume and hairspray all sink into an untreated stone and stay there. Over years a sky blue stone can shift green or develop dark patches where it sat against skin. Some collectors like that and call the result a patina, since it records the life of the piece. Others are unhappy to watch a stone they chose for its colour turn into a different colour. Stabilized turquoise resists all of this, because the resin already occupies the pores. If you own untreated turquoise and want to keep the colour it has today, put it on last and take it off first.
Does matrix lower the value of turquoise?
It depends on which market you are buying in, which is why we treat matrix as a matter of taste. GIA describes the most valuable turquoise as an even medium blue, with no matrix and the ability to take a good polish, and by that standard clean blue material commands the highest price. At the same time, spiderweb turquoise, where fine seams of matrix form web-like patterns across the face of the stone, is prized by collectors and often sells above plain material of the same colour. Matrix is the host rock the turquoise formed inside. Limonite leaves dark brown markings and sandstone leaves tan ones. We keep both kinds in the case, and we let customers choose with their eyes rather than steering them toward the clean blue stones.
Why is turquoise usually set in silver?
Two reasons, one practical and one visual. Silver melts and works at temperatures a bench can control while a heat-sensitive stone sits nearby, and setting turquoise is largely a bezel job, where a thin collar of metal is pushed over the edge of the stone by hand rather than hammered. Silver is soft enough to move under a burnisher without shocking the stone, which matters when GIA rates turquoise at 5 to 6 on the Mohs scale. The visual reason is simply that cool grey-white metal sits well against blue. The long tradition of silver and turquoise in Southwestern and Tibetan work is built on both facts. If you wear silver daily, our guide to choosing silver jewellery for everyday wear covers what holds up.
What questions should I ask before buying turquoise?
Four, and a seller who knows their stock will answer all of them without hesitating. First: is this natural, stabilized, waxed, reconstituted, or an imitation? Second: can you write that answer on my receipt? Third: where is the stone from, and do you know the mine? Fourth: what care does this particular piece need? The written answer is the part people skip and the part that protects you. Canadian guidelines require that the vendor must be prepared to provide to the purchaser, information regarding any treatment that may have been applied, and stabilizing is named in that document as a treatment requiring disclosure. If a seller gets vague, uses the word "genuine" without explaining what it means, or changes the subject to price, walk away. Vagueness about treatment is the warning sign.
Is turquoise a good stone for an everyday ring?
For most people, no, and we say so before taking the order. At 5 to 6 on the Mohs scale turquoise is softer than the quartz dust in ordinary household grit, so a ring worn every day picks up scratches on the polished face within months. GIA rates turquoise toughness as fair to good, and notes that coarse-textured material has poor toughness. A stabilized stone in a protective bezel, worn by someone with a desk job, does fine for years. The same stone on a hand that gardens, lifts, or cleans will not. Pendants and earrings are the safer places for turquoise, because they take almost no impact. If you want a blue stone in a ring you never take off, sapphire at 9 handles daily life far better. Our guide to gemstone hardness sets out where each stone lands.
Sources
- GIA: Turquoise Care and Cleaning Guide
- GIA: Turquoise Description
- GIA: Turquoise Quality Factors
- GIA Gems & Gemology, Winter 2022: Characterization of Porcelain-Treated Turquoise
- Canadian Jewellers Association: Canadian Guidelines for Gemstones, Revised Edition 2015 (PDF)
- US Federal Trade Commission: In the Loupe, Advertising Diamond, Gemstones and Pearls
- Wang and Guo, Royal Society Open Science (2021): The impact of trace metal cations and absorbed water on colour transition of turquoise
Data sourced September 2026. Hardness, toughness and care guidance from GIA. Disclosure terminology from the Canadian Jewellers Association guidelines and the US Federal Trade Commission. Colour chemistry from peer-reviewed research. Prices and stock change, so please confirm with us before travelling in.
Visit Vanhess
We are a family-run studio at 2929 Barnet Highway, Unit 2424 in Coquitlam, and we designed and made most of what sits in our cases. Bring your turquoise in and we will tell you what you have and whether it has been stabilized. If you are shopping, we will say which category each stone falls into before you ask, and write it on your receipt. We serve Coquitlam, Port Moody, Burnaby, New Westminster and Vancouver. Come by, or call us at +1 (604) 653-6449.
