Most turquoise in jewelry is real turquoise, but most of it is treated, and a large share of cheap "turquoise" is something else entirely. There are five groups. Natural turquoise is the stone as mined, only cut and polished. Stabilized turquoise is real turquoise impregnated with clear resin to harden it, and it is the normal market standard. Reconstituted or block turquoise is powder and chips bonded with resin and pressed into blocks. Imitations are usually dyed howlite or dyed magnesite, white stones stained blue, and sometimes plastic. At home, the useful clues are the matrix (the dark veins), whether color pools in cracks, what shows at chips and drill holes, and how the stone sits in its setting. A photo can often separate dyed howlite and plastic from turquoise. It cannot reliably tell natural from stabilized, or name the mine. Value runs from a few dollars for dyed howlite beads to thousands for natural stones from celebrated American mines set by a known Native American silversmith.
Quick answer
- Real turquoise is usually stabilized with resin. That is normal and still turquoise. Dyed howlite, dyed magnesite and plastic are not.
- Color that is darker in cracks and veins, white showing at chips or drill holes, and identical pieces point to dye or imitation.
- Most stabilized turquoise jewelry sells for approximately $20-300. Natural stones from mines such as Lander Blue or Bisbee in signed Native American silver can reach thousands.
How to check yours, step by step
- Look into the cracks and veins. Use a loupe or the phone's macro mode in daylight. You are looking at where the dark matrix lines meet the blue. In dyed stones, the blue is stronger along cracks, pits and veins, because dye collects there. In natural and stabilized turquoise, the color is even right up to the matrix.
- Look at chips, edges and drill holes. On beads, look into the hole. On cabochons, look at any chipped edge. White, chalky or grey material under a blue skin means a dyed stone, very often howlite or magnesite. Turquoise is the same color, or slightly paler, all the way through.
- Read the matrix pattern. Howlite has thick grey to black veins in a web, often with wide, even lines. Dyed magnesite tends to have dark brown to black veins and a cracked, crazy-paving look. Natural turquoise matrix varies: fine black spiderweb, brown or golden iron, silvery pyrite or patchy host rock.
- Compare pieces on the same strand. Natural stones vary in color and pattern. Identical beads, or a pattern that repeats, point to plastic or reconstituted material.
- Feel the weight and temperature. Plastic feels light and warm, and it often shows mold seams or tiny bubbles. Stone feels cool at first.
- Look at the surface shine. Stabilized turquoise often has a bright, slightly glassy polish. Natural, untreated turquoise has a softer, waxy luster and may darken or turn greener with age and skin oils.
- Turn the piece over and read the silver. Look on the back for a stamp (STERLING, 925), an artist's hallmark, initials or a name, and any "Made in" mark. These help date the piece and identify the maker, which often matters more than the stone.
Natural, stabilized, reconstituted or imitation
| Type | What it is | How it usually looks | Typical value |
|---|---|---|---|
| Natural, untreated | Turquoise as mined, cut and polished | Waxy luster, varied color, may darken with wear | Low grades $1-5 per carat, fine American stones $10-100 per carat and up |
| Stabilized | Real turquoise hardened with clear resin | Glassy polish, stable color, often bright | About $0.50-5 per carat, most jewelry $20-300 |
| Enhanced (often called Zachery treated) | Real turquoise treated to improve color and hardness | Very even, rich blue, hard to detect without lab testing | Above stabilized, below natural |
| Color shocked or dyed turquoise | Real turquoise with added dye | Unnaturally bright or deep blue, darker in cracks | Low |
| Reconstituted or block | Turquoise powder or chips bonded in resin | Very uniform, specks like ground pepper, no real veins | A few dollars per piece |
| Dyed howlite | White howlite stone dyed blue | Bright blue with thick grey or black veins, white at chips | $1-10 per strand or piece |
| Dyed magnesite | White magnesite dyed blue or green | Cracked look, dark brown or black veins, white at chips | $1-10 per strand or piece |
| Plastic or resin | Molded imitation | Light, warm, identical beads, seams or bubbles | A few dollars |
Stabilization is so common that untreated turquoise is the exception. In the trade, good stabilized turquoise is acceptable as long as it is disclosed. The stones that should be described as imitations are howlite, magnesite and plastic. The same split between natural, treated and imitation runs through jade, covered in our guide on how to tell if jade is real.
The acetone test and why it is not advised
The classic home test is to dab a cotton swab with acetone, such as nail polish remover, and rub a hidden spot. If blue comes off on the swab, the stone is dyed. That is true, but the test does damage. Acetone softens the resin in stabilized turquoise and can leave a dull spot, it can strip dye and leave a pale patch, and it can lift lacquer or glue on the setting. A hot needle test for plastic, often suggested online, scars the stone and the silver.
On a finished piece of jewelry, especially an older Native American piece, the risk outweighs the answer. The visual checks above are usually enough to separate dyed howlite from turquoise. For a valuable piece where natural versus stabilized matters, a gemologist can test without leaving a mark.
Mine names that carry premiums
American turquoise from named mines sells at a premium, and some deposits are closed or mined out, which pushes prices higher still. A photo can show a look that fits a mine. It cannot prove the mine, and mine names are among the most misused words in the market. Many stones sold as Sleeping Beauty or Lander Blue are from elsewhere.
| Mine | Where | Typical look | Market position |
|---|---|---|---|
| Lander Blue | Nevada, small deposit found in the 1970s | Deep blue with fine black spiderweb matrix | Among the most valuable turquoise in the world, can reach hundreds of dollars per carat |
| Bisbee | Arizona, byproduct of a copper mine closed in the 1970s | Deep blue with chocolate brown or reddish matrix | Strong premium |
| Morenci | Arizona, copper mine byproduct | Bright blue with silvery pyrite matrix | Strong premium |
| Number 8 | Nevada | Blue with golden brown or black spiderweb | Strong premium |
| Sleeping Beauty | Arizona, closed to turquoise mining in 2012 | Even sky blue with little or no matrix | Moderate premium, very widely used in Zuni work |
| Royston | Nevada | Green to blue with brown matrix | Moderate |
| Kingman | Arizona | Bright blue, often with dark matrix, much of it stabilized | Moderate to low |
| Persian | Iran | Robin's egg blue, sometimes with golden matrix | Moderate to high for fine old material |
| Chinese, Hubei | China | Varied, often spiderweb, frequently stabilized | Low to moderate, though fine natural pieces sell well |
Natural turquoise from a documented mine, sold by a dealer with records, carries the premium. A label on an old card with no history adds much less.
Native American silverwork and hallmarks
For many inherited pieces, the silver and the maker matter more than the stone. Southwest jewelry falls into several broad groups.
| Type | Clues | Typical value |
|---|---|---|
| Navajo stamped silver with turquoise | Heavy sterling, hand stamped designs, large stones in bezels | $100-1,500, more for older or signed work |
| Early Navajo (before about 1940) | Ingot or coin silver, thick, hand-hammered, often unmarked, natural stones | $500-5,000 and up for strong pieces |
| Zuni petit point, needlepoint and inlay | Many small matched stones, sometimes coral, jet and shell in inlay | $100-1,000, more for known artists |
| Hopi overlay | Two layers of silver with designs cut out and blackened background, usually little or no turquoise | $100-1,000 |
| Squash blossom necklace | Blossom beads and a horseshoe-shaped naja pendant | $500-5,000 for older or signed, $300-1,500 for newer |
| Fred Harvey era and tourist pieces (about 1900-1960) | Light silver, stamped arrows, thunderbirds, small stones | $20-150 |
| Southwestern style imports | Thin silver, block or dyed stones, "Made in" marks or no marks | $10-75 |
| Known artists (Charles Loloma, Kenneth Begay, Lee Yazzie and others) | Documented hallmarks and distinctive styles | Thousands and up |
Artist hallmarks became common from about the 1970s on. Many fine older pieces are unsigned, so a missing hallmark is not a mark against age. A hallmark that matches a known artist is worth researching, but hallmarks can be copied, and the style should match the signature. US law has made it illegal since 1990 to sell items falsely as Native American made, but older stock and imports labeled loosely still circulate. Our guide on how to tell if silver is real covers the silver marks, and the guide on what 925 means explains modern stamps.
What a photo can show
A sharp daylight photo shows the color, the matrix pattern, dye pooling in cracks, white cores at chips, identical beads on a strand, the silverwork style and the hallmark on the back. That is often enough to separate dyed howlite or plastic from turquoise, and to place a piece as Navajo, Zuni, tourist era or modern import.
A photo cannot tell natural from stabilized or enhanced turquoise, cannot prove a mine and cannot confirm a hallmark belongs to the artist it resembles. Those need hands-on testing, an expert eye and sometimes documentation.
Common mistakes
- Treating stabilized turquoise as fake. It is real turquoise and the normal market standard.
- Trusting a mine name without history. Sleeping Beauty, Lander Blue and Bisbee are claimed far more often than they are true.
- Running acetone or a hot needle on a finished piece. Both can leave permanent marks.
- Valuing by stone size alone. On Native American pieces, the maker, age and silver weight often matter more.
- Assuming an unsigned piece is not Native American made. Many older pieces were never signed.
- Polishing old silver bright. Collectors of older Southwest jewelry often prefer the original patina.
- Overlooking white chips at bead holes. They are the quickest sign of dyed howlite or magnesite.
What to photograph
- The stone straight on in daylight, sharp enough to see the matrix.
- A macro of a crack, vein or chip.
- The back of the piece, with any hallmark, stamp or initials in sharp focus.
- The whole piece on a plain background, showing the silverwork.
- For beads, a few beads lined up and one drill hole close up.
- The piece on a scale with the weight in grams, for silver value.
When to get it looked at in person
- A gemologist can identify dyed howlite, magnesite, plastic and reconstituted material and often detect stabilization, for roughly $50-150 per piece. Worth it for a stone that looks like high-grade natural turquoise.
- A dealer in Native American jewelry knows hallmarks, period styles and mine looks, and is the best judge of an older or signed piece. Many give a verbal opinion at no charge.
- An appraiser charges roughly $50-150 per item or $100-300 an hour. Worth it for a squash blossom, a collection of older Navajo or Zuni work, or insurance.
- An auction house with an American Indian art department can estimate strong pieces at no upfront cost.