GREAT VALUE LOT 157 cts 19 pc TURQUOISE – USA

Turquoise is a gemstone that carries the weight of history and the spirit of the earth. Unfortunately, much of what you see online today is fake or heavily dyed material, often "reconstituted" from dust and plastic. This makes a true, high-quality specimen a rare find. The material I work with is genuine, as I have cut it myself directly from the rough material. There are no enhancements, no "stabilization" polymers, and absolutely no dye used—it is natural, pure beauty. When you hold a piece of authentic Turquoise, you feel a connection to a mineral that has been prized by kings, warriors, and shamans for over six thousand years. It is a stone of sky and stone, possessing a soft, waxy luster and a color that feels both ancient and alive.

Historical Significance: Turquoise is one of the oldest gemstones in human history. Historically, it was mined by the Ancient Egyptians in the Sinai Peninsula as early as 3000 BCE and was revered by the Aztecs and the Indigenous peoples of the American Southwest as a sacred protector. It represents a specific geochemical environment where copper-rich water seeps through phosphorus-bearing rocks in arid climates. In the world of fine gems, it is celebrated for its range from "Robin’s Egg" blue to vibrant "Apple" green, often featuring a beautiful "spider-web" matrix of host rock. It stands as a symbol of wisdom and nobility, bridging the gap between the terrestrial and the divine across almost every major civilization.

Discovery: The name is derived from the Old French turquoise, meaning "Turkish," as the stone first reached Europe through Turkish trade routes from the historic mines of Persia. Scientifically, it is a hydrated phosphate of copper and aluminum. Its discovery in the arid deserts of the world—from Iran to Arizona—helped mineralogists understand the complex "secondary" mineralization that occurs in the weathered upper layers of copper deposits.

Important Mines: The legendary Nishapur district in Iran (Persia) has produced the global benchmark for "clear blue" Turquoise for millennia. In North America, I have a high regard for the Sleeping Beauty Mine in Arizona (known for its pure sky-blue) and the Kingman Mine for its iconic matrix patterns. I also value the material from the Hubei Province in China, provided it is untreated. For the vault, I prioritize these "old stock," natural pieces that I have personally hand-cut, as their color is stable and their provenance is beyond question.

Description: Turquoise is a hydrated phosphate of copper and aluminum that crystallizes in the triclinic system, though it almost always occurs in massive, cryptocrystalline forms. It sits at a 5 to 6 on the Mohs scale, making it a relatively soft stone that should be protected from perfumes, oils, and extreme heat. It is characterized by its waxy to sub-vitreous luster and its opaque, vibrant color.[Image showing the difference between a natural "Spider-web" Turquoise matrix and the uniform, artificial look of dyed magnesite]

One of its most identifying traits is its porous nature. Because it is a secondary mineral formed in arid zones, it can absorb oils over time, which is why much commercial material is "stabilized" with resin. However, my untreated pieces retain their natural breathability and authentic color. It has a refractive index ($n \approx 1.61$ to $1.65$) and a specific gravity of $2.6$ to $2.9$. The blue color is provided by copper, while the presence of iron shifts the hue toward green. When I cut Turquoise, I carefully follow the natural veins of the rough to preserve the "story" of the host rock, ensuring that the final gem is a unique, unadulterated piece of geological art.

Chemical Formula: CuAl₆(PO₄)₄(OH)₈·4H₂O