Purchasing turquoise jewelry involves navigating a market where genuine stones often coexist with various imitations and treated materials. For buyers, the challenge lies in distinguishing authentic, naturally formed turquoise from alternatives that mimic its appearance but lack its inherent value and durability. Understanding the specific characteristics of real turquoise, alongside the methods used to create fakes, is essential for making informed decisions and protecting your investment in this distinct gemstone.
Identifying Genuine Turquoise Characteristics
Authentic turquoise exhibits a range of natural properties that differentiate it from substitutes. These characteristics are the primary indicators to evaluate when assessing a piece.
Color and Luster
Genuine turquoise displays a spectrum of blue and green hues, from sky blue to apple green. The color is typically opaque and can show subtle variations within a single stone, reflecting its natural formation. A uniform, overly bright, or unnaturally vivid color across an entire piece can suggest artificial dyeing. The luster of natural turquoise is typically waxy to sub-vitreous (slightly glassy), not overly shiny or plastic-like.
Matrix Patterns
Many natural turquoise stones feature a matrix – a web-like pattern of the host rock (often limonite or sandstone) embedded within the turquoise. This matrix can be black, brown, or tan and forms distinctive, irregular patterns. While some high-grade turquoise is matrix-free, the presence of a natural, non-uniform matrix is often a strong indicator of authenticity. Fakes may attempt to replicate this with painted lines or uniform, unnatural patterns.
Texture and Density
Real turquoise has a specific density and a slightly cool, smooth feel to the touch. Its surface, while polished, should not feel overly slick or plastic. It is also a relatively porous stone. The weight of genuine turquoise, when compared to its size, should feel substantial, not exceptionally light, which can be an indicator of plastic or resin imitations.
Common Turquoise Imitations and Treatments
The market employs several methods to create turquoise look-alikes or enhance lower-grade material. Recognizing these is crucial.
Dyed Howlite and Magnesite
Howlite and magnesite are naturally white, porous minerals that readily absorb dye. When dyed blue or green, they can closely resemble turquoise, often with black veins painted on to mimic a matrix. These are among the most common and convincing fakes. They typically feel lighter than real turquoise and may show dye concentrations in crevices or faded areas over time.
Reconstituted and Stabilized Turquoise
Not all treated turquoise is considered "fake," but understanding the distinction is important.
- Reconstituted Turquoise: This is made from powdered turquoise fragments, often mixed with plastic resin or epoxy, then compressed and dyed into solid blocks. It lacks the natural integrity of solid turquoise and is essentially a composite material.
- Stabilized Turquoise: This involves impregnating natural, lower-grade, porous turquoise with a clear epoxy resin under pressure. This process hardens the stone, enhances its color, and makes it more durable. Stabilized turquoise is still considered real turquoise, just treated, and is widely accepted in the jewelry industry, though it should be disclosed by sellers.
Plastic and Resin Fakes
Purely synthetic materials like plastic or resin are molded and colored to imitate turquoise. These pieces often look too perfect, have a uniform color without natural variation, and feel noticeably lighter and warmer to the touch than genuine stone. Their luster can be overly glossy or distinctly plastic-like.
Practical Tests for Authenticity
While definitive identification often requires gemological equipment, several practical tests can help consumers assess turquoise.
Visual Examination
Start with a thorough visual inspection under good lighting. Look for color consistency, the natural irregularity of any matrix, and the overall surface quality. Be suspicious of pieces that are too uniform in color or have an unnaturally perfect, painted-on matrix.
Touch and Temperature
Genuine turquoise tends to feel cool to the touch and will warm up slowly when held. Plastic or resin fakes, conversely, will often feel warmer or quickly adapt to body temperature.
Weight and Density
Hold the piece in your hand. Real turquoise has a certain heft. If it feels unusually light for its size, especially compared to other similar-sized stones, it might be a plastic or dyed imitation.
Scratch and Acetone Tests (Caution Advised)
Pro Tip: Conduct any scratch or acetone test on an inconspicuous area, such as the back or underside of the stone, to avoid damaging the visible surface. These tests are destructive and should be used as a last resort, or only if you are willing to risk minor damage to the piece.
Scratch Test: Genuine turquoise is relatively soft (5-6 on the Mohs scale), but harder than many plastics. A very light scratch with a metal point (like a pin) on an inconspicuous area might reveal white powder if it’s dyed howlite/magnesite, or leave no mark if it’s plastic. Real turquoise would show a faint scratch that matches the stone's color.
Acetone Test: Apply a small amount of acetone (nail polish remover) to a cotton swab and dab it on an inconspicuous spot. If dye transfers to the swab, it indicates a dyed imitation like howlite or magnesite. This test will not affect natural or stabilized turquoise, but it can damage some plastics.
Assessing the Seller and Source
Beyond examining the stone itself, the credibility of the seller and the origin of the jewelry play a significant role in ensuring authenticity.
Reputation and Transparency
Purchase from reputable jewelers, galleries, or dealers who specialize in Native American or Southwestern jewelry, as these are common sources for genuine turquoise. A trustworthy seller will be transparent about the stone's origin, whether it's natural, stabilized, or reconstituted, and should be able to answer questions regarding its authenticity.
Price Considerations
Genuine, high-quality turquoise is a valuable gemstone. Prices that seem too good to be true, especially for large, perfectly colored, matrix-free pieces, are often an indicator of a fake or heavily treated stone. While stabilized turquoise is more affordable than natural, untreated turquoise, it still holds more value than dyed imitations or plastic.
Certifications and Documentation
For higher-value pieces, ask if the seller can provide a certificate of authenticity from an independent gemological laboratory. While not always practical for every piece, this documentation offers verifiable proof of the stone's identity and treatment status.
Making Informed Turquoise Purchases
Identifying fake turquoise jewelry requires a combination of visual discernment, tactile examination, and an understanding of common imitations. Prioritize purchasing from established sellers who offer clear disclosures about their materials. By familiarizing yourself with the natural characteristics of turquoise and the methods used to create fakes, you can approach your next jewelry purchase with greater confidence and ensure you acquire a genuine piece.
Frequently Asked Questions
Is stabilized turquoise considered real?
Yes, stabilized turquoise is real turquoise that has been treated with a clear resin to enhance its durability and color. It is widely accepted in the jewelry industry, though it should be disclosed as treated.
Can a magnet test turquoise?
No, a magnet test is not a reliable method for identifying genuine turquoise. Turquoise is not magnetic, and neither are most common imitations like howlite or plastic.
What is "chalk turquoise"?
"Chalk turquoise" refers to low-grade, highly porous turquoise that is often too soft or crumbly to be used in jewelry without extensive treatment. It is typically stabilized and often dyed to improve its appearance and hardness.
Does real turquoise change color over time?
Yes, natural, untreated turquoise can subtly change color over time due to exposure to oils from the skin, lotions, light, and other environmental factors. It may shift towards a greener hue.
