What Is Kingman Turquoise? Arizona’s Famous Blue Stone

AvatarByEric Dawson Jewelry & Gemstones

Kingman turquoise is a blue to blue green gemstone mined at Mineral Park in the Cerbat Mountains, about 14 miles northwest of Kingman, Arizona. Copper in the deposit gives the stone its sky blue color, and thin veins of pyrite, quartz and calcite leave behind the rippling water web matrix collectors look for. The Colbaugh family has run the mine since the early 1960s, and as of September 2026 it is the last turquoise mine in the United States still producing on a commercial scale. Most of what reaches the market is stabilized rather than fully natural.

What Kingman Turquoise Is and Where It Comes From

Mineral Park in Arizona’s Cerbat Mountains is where Kingman turquoise comes from, and copper in the deposit is what gives the stone its color and look. Buyers pay for that look, and dealers describe stones by mine because two cabochons of the same shade can differ in hardness, in web and in how they age in a setting.

The Mineral Park Deposit

The mine sits in the Mineral Park district of the Cerbat Mountains, written in some older sources as the Acerbate Mountains, roughly 14 miles northwest of the town of Kingman in Mohave County, Arizona. Elevation at the site is about 3,300 feet. The deposit splits into two working areas, and a stone’s color often tracks which of them it came from.

Ithaca Peak and Turquoise Mountain

Two areas produce the material sold under the Kingman name: Ithaca Peak and Aztec Peak, the second of which the trade calls Turquoise Mountain. Ithaca Peak is the source most people picture, the vivid sky blue with a tight web running through it. Aztec Peak has also yielded a green turquoise that has picked up a following of its own, to the point that Durango Silver describes the green material as gaining popularity equal to the blue.

Copper in the host rock is what makes the blue. Pickle Barrel Trading Post credits that same copper content with the stone’s comparative durability, which matters for a mineral that sits fairly low on the hardness scale to begin with.

How Kingman Turquoise Got Its Reputation

Kingman turquoise built its name on centuries of Native American mining followed by a 1970s production boom, when the Colbaugh-run mine supplied close to half the turquoise sold worldwide.

Ancient Mining in the Cerbat Mountains

People were digging turquoise out of this ground long before anyone called it Kingman. Archaeological evidence points to extraction around 600 A.D., and ancient stone hammers turned up in the surrounding area, a set of them found by Chuck Colbaugh in 1962. By roughly 1000 A.D., Navajo, Hopi and Zuni people were mining the region and working the stone into ceremonial objects and traditional jewelry.

The Modern Claim and the Colbaugh Years

Credit for the modern discovery generally goes to James W. Haas, though the date is unsettled. One source reproduces a 1902 account in which Haas put his find about twenty-eight years earlier, which would place it near 1874, while other accounts give 1885. T.Skies, which lays out both, simply notes that the dates vary. The town itself was established around 1882, named for Lewis Kingman, who was surveying the railroad line.

Commercial work in the district started somewhere between the late 1880s and the early 1900s. Chuck Colbaugh took over the turquoise mining contract for Ithaca Peak and Turquoise Mountain in the early 1960s, and his family has held the operation ever since. Marty Colbaugh and his son Josh represent the third and fourth generations still involved as of 2026.

The 1970s Boom

Under Leonard Hardy, the mine hit a scale no American turquoise operation has matched since. Reports put the 1973 output above 80,000 pounds, and during that decade Kingman supplied close to half the turquoise sold worldwide. Volume on that order is the reason so much vintage Southwestern silverwork holds Kingman stone, often without the paperwork to prove it. Dealers still treat an unattributed older cabochon as probable Kingman for exactly that reason.

What Kingman Turquoise Looks Like

Color Range from Sky Blue to Green

Sky blue is the signature, the shade most people mean when they say American turquoise. Shades run from pale, almost chalky blue through robin’s egg to a deep saturated turquoise, with greenish blue stones common across the deposit and true green material coming mainly out of the Turquoise Mountain workings.

Color Description Standing in the Trade
Sky blue Pale to medium blue, the standard American turquoise look Most famous
Deep turquoise Rich, darker blue tones Highly prized
Robin’s egg blue Medium blue with a distinctive hue Notable variant
Greenish blue Blue carrying green tones Available across the deposit
Green Mainly from the Turquoise Mountain section Popularity now close to the blue

Color alone does not set value. Hardness, the intensity of the blue and the character of the matrix all feed into what a stone is worth, and a hard, deeply colored cabochon with a clean web will outrank a softer stone in a more fashionable shade.

Water Web, Spider Web and Nugget Matrix

Matrix is the host rock left inside the stone, and on Kingman material it usually arrives as fine veins of pyrite, calcite and quartz. Water web is the pattern the mine is known for, a medium blue stone crossed by lines that read like ripples moving over water. Good water web is rare, and at the top grades it drives the desirability of a cabochon as much as color does. Spider web, the tighter and more even cellular pattern, is generally described as the most valuable turquoise pattern of all.

Not all Kingman matrix is white. Documented specimens run from white through light brown to black, and black web Kingman is real, which matters because a buyer who assumes white matrix is mandatory will reject genuine stones. Nuggets are the other Kingman signature, whole rounded pieces cut to keep their natural shape rather than ground down to a standard oval.

How Hard Is Kingman Turquoise and How Is It Graded

Hardness and Porosity

Kingman turquoise sits at roughly 5 to 6 on the Mohs scale, which puts it below quartz and well below the stones people think of as everyday hard wear. Softer material is also more porous, and porous turquoise takes up oils, lotions and dye from whatever touches it. Staining is the usual outcome, it is not reversible, and that single fact explains most of why stabilization became standard practice.

The Grading Ladder

Durango Silver publishes a grading scheme that covers turquoise generally rather than Kingman alone, and it is the vocabulary most American dealers use. Ratings run from AAAA down through the letter grades, and hardness tracks the rating closely, since a harder stone takes a better polish and survives being set.

Grade Rating Hardness (Mohs) Share of Output What It Means
High grade natural AA, AAA, AAAA 5 to 7 Small share Spider web and other rare patterns, hardest material, sold untreated
Standard natural AA minus, A, B, C 4 to 5 20 to 30 percent Mid range color and hardness, workable without treatment
Low grade natural Below B Under 4 60 percent or more Soft and porous, needs stabilizing before it can be cut

Numbers matter more than the letter codes here. Roughly 60 percent or more of what a turquoise mine pulls is low grade, so the majority of Kingman rough was never going to reach a jeweler untreated, and scarcity at the top of the ladder is structural rather than a sales line.

A Worked Example from the 1973 Output

Take the peak year as arithmetic rather than as a headline. If the mine moved 80,000 pounds in 1973 and the published grade split holds, roughly 48,000 pounds of that run was low grade material bound for stabilization, and 16,000 to 24,000 pounds fell into the standard natural band. What is left, somewhere between 8,000 and 16,000 pounds on paper, is the ceiling for high grade rough, and because the sources describe high grade as a very small share of any mine’s yield, the true figure sits at the bottom of that range or below it. That calculation is derived from the percentages Durango Silver publishes, not a tonnage the mine has reported.

Why Most Kingman Turquoise Is Stabilized

The reason most Kingman turquoise is stabilized comes down to what the mine actually produces: soft, porous, low grade rough that would stain and crumble if left untreated.

What Stabilization Does

Stabilization pushes epoxy into the pores of a soft stone under pressure. Color deepens, the material stops crumbling under a saw, and a cabochon that would have been unusable becomes something a silversmith can set. Colbaugh Processing built much of its business on exactly this, treating medium and low grade rough from Kingman and from other mines in the United States and abroad.

Leonard W. Hardy worked out the process for Kingman material during the 1950s and 1960s, and the first documented treated Kingman dates to 1961. Since then, most of what has sold commercially has been treated in some way. Some lower grade stones get more than epoxy, because a pale matrix is sometimes darkened artificially so the pattern reads with more contrast, which is common practice but should be disclosed on the receipt.

Where the Sources Disagree

One retailer, Coral Strands, describes Kingman turquoise as not typically treated or enhanced with dyes or other artificial means. Weighed against T.Skies, Pueblo Direct and Durango Silver, all three of which document stabilization as routine since the early 1960s, that claim does not hold up as a general statement about the mine’s output. The most charitable reading is that it describes natural, untreated Kingman specifically, which does exist and is prized. Treat an untreated claim as something to verify in writing rather than something to assume.

I would not rule out a Kingman piece simply because it is stabilized. With most commercial Kingman having been treated for decades, stabilization seems like a practical response to a porous stone rather than a reason to dismiss it. My line would be clear disclosure and a price that reflects the treatment. I would pay extra for fully natural material only when its hardness, color and matrix make that difference visible and durable, not just because the word natural sounds more desirable.

How to Tell Real Kingman Turquoise from Look-Alikes

What to Ask the Seller

The surest way to tell real Kingman turquoise from a look-alike is to get a written guarantee from the seller naming the mine, stating the treatment status and identifying the seller. Appearance alone will not settle it, since material from Mexico and China can look very close to Kingman once a stone is cut and set into silver. Reputable dealers hand this over without argument, and a refusal to put it in writing is itself an answer.

  1. Mine of origin: the words Kingman, Mineral Park or Mohave County in writing, not a vague label like Arizona turquoise.
  2. Treatment status: natural, stabilized, or stabilized with the matrix darkened, stated plainly rather than left blank.
  3. Seller identity: full business name and address on the paperwork, so the guarantee is attached to someone reachable.
  4. Return window: a stated period during which the piece can go back if an independent opinion contradicts the guarantee.

If the Stone Still Does Not Add Up

Suppose the paperwork is thin and the seller has gone quiet. Start with what the stone itself can tell you rather than with the asking price. A white matrix is not proof of Kingman and a black web does not rule it out, so pattern alone settles nothing, and the more useful move is comparing the piece against documented Kingman material in an established dealer’s reference photographs.

Failing that, the honest position is uncertainty. An older unattributed cabochon from a Southwestern estate piece is statistically likely to be Kingman, given how much stone the mine put into circulation during the 1970s, but likelihood is not provenance. Pay the price of unattributed turquoise instead of the premium for a named mine, and treat any later confirmation as a bonus.

What Kingman Turquoise Means to Navajo, Hopi and Zuni Communities

Kingman turquoise carries deep meaning for Navajo, Hopi and Zuni communities, who have worked it into ceremonial objects, traditional jewelry and daily cultural practice for centuries and see the stone as a symbol of sky, water and the natural world. Buying a piece made by a Native silversmith is not the same transaction as buying a mass produced cabochon, and the distinction is worth respecting.

Modern jewelry use spans bracelets, money clips, earrings and necklace sets, often paired with sterling silver, coral or oyster shell. Because every pocket of the deposit formed under slightly different conditions, no two stones carry the same combination of color and web, which is a large part of the appeal for collectors and artisans alike.

How to Care for a Kingman Turquoise Piece

Care comes down to keeping the stone away from anything that can soak into it. Even a stabilized cabochon has a surface that reacts badly to solvents, and untreated material is far more vulnerable.

  1. Put it on last: perfume, hairspray, sunscreen and lotion all go on first and dry before the jewelry does.
  2. Wipe after wearing: a soft dry cloth lifts skin oils off the surface before they migrate into the stone.
  3. Skip the cleaners: ultrasonic tanks, steam and ammonia based dips are all wrong for a stone in the 5 to 6 hardness range.
  4. Take it off for water: pools, hot tubs and dishwater carry chlorine and detergent straight into porous material.
  5. Store it separately: harder gems and even a sterling chain will scratch a turquoise face in a shared pouch.

None of that is exotic maintenance. Every step follows from two properties already covered, porosity and a hardness of 5 to 6, and a piece looked after this way is far less likely to pick up a stain that cannot be undone.

A Timeline of the Kingman Turquoise Mine

Kingman turquoise mining spans roughly 1,400 years, from ancient extraction around 600 A.D. to commercial production continuing today under the Colbaugh family. Dates below come from the mine’s retail partners and dealer histories, and several are approximate, which the sources themselves acknowledge.

Period Development
About 600 A.D. Evidence of turquoise extraction using ancient stone tools
About 1000 A.D. Mining and ceremonial use documented among Navajo, Hopi and Zuni people
1874 to 1885 Modern discovery, generally credited to James W. Haas; sources give different dates
About 1882 Town of Kingman established, named for railroad surveyor Lewis Kingman
Late 1880s to early 1900s Commercial mining begins in the Cerbat Mountains
1950s and 1960s Leonard W. Hardy pioneers stabilization treatment for Kingman material
1961 First documented treated Kingman turquoise
1962 Chuck Colbaugh finds ancient stone hammers near the workings
Early 1960s Chuck Colbaugh obtains the Ithaca Peak and Turquoise Mountain contracts
1973 Peak production of more than 80,000 pounds
1970s Kingman supplies close to half the turquoise sold worldwide
September 2026 Colbaugh family still operating; high grade natural material scarce, demand strong

Reading the table end to end shows the pattern that matters for a buyer: enormous volume through the middle of the twentieth century, then a long tail in which that volume is gone and good natural material is scarce. Demand for quality American turquoise remains high as of September 2026, and the Colbaugh operation is the only commercial turquoise mine in the country still feeding it.

Frequently Asked Questions

Is Kingman Turquoise Real Turquoise?

Yes. Kingman is a mine name rather than a synthetic or a simulant, and the material is genuine turquoise pulled from the Mineral Park deposit. What varies is treatment, since most commercial Kingman has been stabilized with epoxy since the 1960s, which is still real turquoise but not untreated turquoise. Ask which of the two you are buying.

Is the Kingman Mine Still Open?

Mining continues as of September 2026. The Colbaugh family operates it, with third and fourth generation family members involved, and it is the last turquoise mine in the United States producing commercially. Output no longer resembles the 1970s figures.

Why Does Some Kingman Turquoise Look Green?

Green material comes chiefly from the Turquoise Mountain side of the deposit rather than from Ithaca Peak. Durango Silver reports that the green stone has gained popularity on a par with the blue, so it is not a lesser product. Greenish blue stones also occur across the deposit as part of the normal color range.

Does Stabilized Kingman Turquoise Lose Value?

Stabilized stones sell for less than comparable natural ones, because untreated high grade material is scarce and demand for it is strong. Treatment is not fraud, though, and undisclosed treatment is the actual problem. A stabilized cabochon sold honestly as stabilized is a fair purchase at a fair price.

What Should a Written Guarantee Include?

Three things at minimum: the mine the stone came from, whether it was treated and how, and the full identity of the seller. Experts cited in the T.Skies field guide recommend exactly that combination, because two of the three become impossible to verify by eye once a stone is set. Keep the document with the piece.

Anyone shopping for this stone can sort the question into two parts, whether it is Kingman and whether it is treated. Provenance in writing settles the first, and an honest disclosure settles the second. Hardness, color and the character of the web then decide what a piece is worth, and a stabilized stone bought as a stabilized stone is no disappointment.

What This Page Does Not Publish

  • I don’t quote Kingman prices here; grade, treatment and matrix make any single figure misleading.
  • I don’t cover the mine’s environmental practices here.
  • This page does not give personalised advice.

References

Author Profile

Eric Dawson
Eric Dawson
I'm Eric Dawson, the writer behind The Money Watch. I live in the Columbus, Ohio area and I write about the ordinary questions that turn out to be complicated: computers, shopping, food, travel, parking, small businesses, fees, rules and products. Every article starts with the official page, the maker or the agency, then the sources that check it, and I say plainly where they disagree and what I would do. More about how I work is on the About page.