Turquoise: Gem from the Sky


Turquoise, also known as 'pine stone,' is renowned worldwide for its unique blue and green hues and captivating textures. It is a copper-aluminum phosphate mineral with the chemical formula CuAl6(PO4)4(OH)8·4H2O. Since ancient times, turquoise has been regarded as a sacred object connecting heaven and earth, communicating with deities, carrying rich cultural connotations and mysterious colors. In modern times, with the improvement of aesthetic taste and the pursuit of natural gemstones, the collection value and market popularity of turquoise continue to rise.

I. Historical Origins and Cultural Significance of Turquoise


The history of turquoise dates back thousands of years, making it one of the earliest gemstones mined and used by humans.



    • Ancient Egyptian Civilization: As early as 5500 BC, Egyptians began mining and using turquoise. Pharaoh Tutankhamun's golden mask was inlaid with a large amount of turquoise, symbolizing eternal life and divine power. Ancient Egyptians believed turquoise brought good luck and protection, considering it the 'stone of heaven.'

    • Native American Culture: In North and Central American indigenous cultures, including the Aztecs, Incas, and Navajos, turquoise was considered a sacred gem, used to create religious artifacts, ornaments, and amulets. They believed turquoise was a bridge between sky and earth, spirit and matter, bringing health, wealth, and wisdom. Navajo silver jewelry combined with turquoise formed a unique ethnic style.

    • Persian Culture: Ancient Persians regarded turquoise as the 'stone of victory,' believing wearing it brought good luck and warded off evil. Persian turquoise, known for its pure sky blue, was widely used to decorate mosques, palaces, and jewelry.

    • Chinese Culture: China also has a long history of using turquoise, dating back to the Neolithic age. During the Shang and Zhou dynasties, turquoise was often unearthed with bronze ware, used for inlay and decoration. In the Qing Dynasty, turquoise was listed as the 'Emperor's Stone,' often used in court beads and official attire accessories. Turquoise ornaments in the shape of Jade Pendant and Safety Buckle were also deeply loved, symbolizing auspiciousness and peace.

II. Unique Characteristics and Classification of Turquoise


The charm of turquoise lies in its varied colors, unique structure, and natural textures.


2.1 Color and Luster


Turquoise colors range from sky blue to greenish-blue, to apple green and light green. Among them, pure, highly saturated 'sky blue' is considered the most precious color, especially high-porcelain, high-blue turquoise. Turquoise usually exhibits a waxy to vitreous luster; the finer the texture, the stronger the luster.


2.2 Texture and Structure



    • Matrix: The surface of turquoise often has black or brown reticulated patterns, known as 'matrix' or 'iron lines.' These are formed when limonite or other iron-containing minerals penetrate during the formation of turquoise. Turquoise with evenly distributed, aesthetically pleasing matrix patterns can actually increase in value, forming unique 'spiderweb' or 'turtleback' patterns.

    • Porcelain Grade (Cidù): Refers to the compactness and hardness of turquoise. High-porcelain turquoise has a smooth, oily surface, a crisp sound when tapped, and a hardness close to 5-6, making it resistant to scratches. Lower-porcelain turquoise is looser in texture and prone to dehydration and discoloration.

    • Jadeization: Some high-quality turquoise, under prolonged geological processes, becomes extremely dense, exhibiting a warm, semi-translucent quality similar to jade, known as 'jadeized turquoise,' which is highly valuable.


2.3 Main Origins


Numerous turquoise producing areas exist globally, but the following are the most famous:



    • Hubei, China: Turquoise from Zhushan and Yunyang in Hubei is known for its high-porcelain, high-blue, and fine texture, making it one of the recognized sources of high-quality turquoise on the market. High-quality material from mines like 'Dongzigou' and 'Yajiaoshan' is highly sought after by collectors.

    • Iran (Ancient Persia): Iran is one of the oldest turquoise producing areas in the world. Its turquoise is characterized by pure sky blue and little to no matrix, known as 'Persian Blue,' and is considered a top-grade turquoise.

    • United States: The southwestern US (e.g., Arizona, Nevada) also produces abundant turquoise, with diverse colors and often unique matrix patterns. 'Sleeping Beauty' turquoise is famous for its uniformly pure blue color.

    • Egypt: The Sinai Peninsula is an ancient turquoise producing area, with turquoise typically greener in color and softer in texture.

III. Identification and Distinguishing Authenticity of Turquoise


The market contains many imitations and treated turquoise. Mastering correct identification methods is crucial.


3.1 Common Imitations



    • Gilson Turquoise: A synthetic turquoise, uniform in color with no matrix. Under magnification, internal granular or layered structures can be observed.

    • Dyed Howlite/Magnesite: Howlite (magnesite) is porous and easily dyed. Dyed howlite has overly uniform, vivid colors and may bleed color when wiped with alcohol.

    • Stabilized Turquoise (Resin-Impregnated): To improve hardness and luster, low-quality turquoise is often treated with resin. Stabilized turquoise may fluoresce under UV light, have an unnatural 'greasy' luster, and a resinous sheen at the fracture point.

    • Wax-Impregnated Turquoise: Similar to resin impregnation, but deeper, aiming to improve color and stability.


3.2 Key Identification Points



    • Color: Natural turquoise usually has slight color variations or natural matrix lines. Be wary of overly uniform, vivid, and flawless turquoise.

    • Luster and Porcelain Grade: Natural high-quality turquoise has a warm waxy or vitreous luster, a delicate feel, and high porcelain grade. Imitations or low-quality treated pieces may have a 'greasy' or overly plastic luster.

    • Matrix: Natural matrix lines are fluid and naturally integrated with the turquoise body. Artificially drawn lines appear stiff and unnatural.

    • Touch and Temperature: Natural turquoise feels cool to the touch and has a certain weight. Imitations may feel warm or light.

    • Patina Development: Natural turquoise, after long-term wear and 'playing,' absorbs body oils, causing its color to deepen and become more lustrous, forming a 'patina.' This is part of its charm and an important basis for authenticity identification. Imitations will not exhibit this change.

    • Professional Testing: The most reliable method is to send it to a professional gemological laboratory for testing, using techniques like infrared spectroscopy and X-ray diffraction to determine its authenticity and treatment status.

IV. Collection and Price Trends of Turquoise


The price of turquoise is influenced by various factors, including color, porcelain grade, size, matrix distribution, origin, and craftsmanship.


4.1 Factors Affecting Price



    • Color: High-porcelain, high-blue turquoise is the most valuable, followed by high-porcelain green. Pure, uniform colors are more sought after.

    • Porcelain Grade: Higher porcelain grade means harder, denser texture, better 'playing' effect, and higher price. Terms like 'high-porcelain' and 'jadeized' are used to describe its premium quality.

    • Size and Weight: Turquoise is priced by carat or gram. Larger and heavier turquoise, of comparable quality, will have a higher unit price.

    • Matrix: Turquoise with no matrix or with evenly distributed, aesthetically pleasing matrix (e.g., spiderweb, turtleback) is more popular. Chaotic matrix patterns can reduce the price.

    • Origin: High-quality turquoise from Hubei Zhushan, Iran, etc., commands a generally higher Market Price due to its rarity and superior quality.

    • Craftsmanship: Exquisitely carved and uniquely shaped turquoise ornaments significantly increase their artistic and craftsmanship value. For example, a finely carved turquoise Jade Pendant or Safety Buckle can be worth far more than a raw stone of the same size.


4.2 Collection Advice



    • Focus on Quality: Prioritize high-porcelain, high-blue, untreated, and crack-free turquoise. Such turquoise not only has higher aesthetic value but also greater collection potential.

    • Consider Origin: If budget allows, consider collecting turquoise from premium origins like Hubei Zhushan and Iran.

    • Choose Fine Pieces: Select unique shapes, exquisite carvings, or plain beads/cabochons with natural distinctive patterns.

    • Learn Identification: Study professional turquoise knowledge to improve identification skills and avoid purchasing fakes or inferior products.

    • Monitor the Market: Understand current Market Prices to avoid blind following or being overcharged.


In recent years, with the increasing scarcity of turquoise resources and growing market demand, its price has shown a steady upward trend. High-porcelain, high-blue fine pieces, in particular, have seen more significant increases. For collectors, choosing natural turquoise with good appearance and no treatment is a key guarantee for value appreciation.

V. Care for Turquoise


Turquoise is a delicate gemstone that requires careful handling.



    • Avoid High Temperatures and Chemicals: Turquoise is sensitive to high temperatures, acids, and alkalis. Avoid contact with hot water, cosmetics, perfumes, cleaning agents, etc.

    • Avoid Impact: Turquoise has a relatively low hardness, so avoid collision with hard objects to prevent damage.

    • Regular Cleaning: Gently wipe with clean water and a soft cloth to remove surface dirt, but never use ultrasonic cleaning.

    • Frequent Handling: The oils secreted by the human body nourish turquoise. Regular wearing and handling can deepen its color and enhance its luster.

    • Sealed Storage: When not wearing for extended periods, wrap it in a soft cloth and place it in a sealed bag to prevent dehydration.


In conclusion, turquoise, with its unique charm and profound cultural heritage, holds an important position in the gemstone collection world. Whether as an ornament or an investment, a deep understanding of its characteristics, mastery of identification techniques, and attention to market price will help you better appreciate and own this 'stone of the sky' from ancient times.