8/18/2023 0 Comments Gem quality turquoise![]() Facts Mineral: Turquoise Chemistry: CuAl 6 (PO 4) 4 (OH) 8.5 H 2 O Color: Blue to green Refractive Index: 1.610 to 1.650 Birefringence: Not detectable Specific Gravity: 2.76 (+0.14, -0. There are some contemporary designers who actively seek avocado and lime green turquoise. 1519 Montezuma, thinking Cortes was Quetzalcoatl, gave him the god’s favorite gem: turquoise. Generally speaking, turquoise with a green to greenish blue color is less desirable than turquoise with a pure blue hue, but it depends on personal preference. Turquoise is an opaque, blue-to-green mineral that is a hydrated phosphate of copper and aluminium, with the chemical formula CuAl6 (PO4)4 (OH)8♴H2O. The traditional source for this color is the Nishapur district of Iran, so you’ll also hear it described as “Persian blue,” whether or not it was actually mined in Iran. Turquoise Color Blue Turquoise The most-prized turquoise color is an even, intense, medium blue, sometimes referred to as robin’s egg blue or sky blue in the trade. Additionally, for the highest values, turquoise should have a medium-dark tone. Typically, turquoise is judged on three basic quality factorscolor, texture, and the presence or absence of matrix. Arizona’s Turquoise Mountain mine once produced material with this quality. The most-prized turquoise color is an even, intense, medium blue, sometimes referred to as robin’s egg blue or sky blue in the trade. However, color zoning that creates a bird’s eye effect, with dark material surrounding light-colored nodules, is valued for its rarity. Typically, turquoise is judged on three basic quality factors-color, texture, and the presence or absence of matrix. Natural Turquoise (not High Grade, but standard jewelry. Gübelin collection.įine-quality turquoise is sought after around the world by designers of unusual jewelry pieces. These top three Turquoise Grades are usually in the 5-7 range on the Mohs Scale of gemstone hardness. The finest Turquoise has an intensely blue uniform color. High-grade turquoise jewelry is the cream of the crop, taking the best polish while being the absolute hardest grade to come by. ![]() The even blue color of the cabochon on the right would be called “Persian blue” in the trade. Turquoise Quality Factor The most valuable Turquoises are those without veins. The green turquoise cabochon, from an American mine, might become part of a designer’s unique jewelry piece. Avant Mining has long been dedicated to environmentally sound and ethically minded crystal mining. ![]() For this reason, it is often associated with copper deposits as a secondary mineral. Not only focusing on quartz crystals, It’s Arkansas based Mona Lisa Mine is the only gem-quality turquoise mine in the eastern half of the United States. In fact, Turquoise is a hydrated phosphate of copper and aluminum and is the result of percolation of meteoric or groundwater through aluminous rock in the presence of copper. Comprehensive CAD/CAM For Jewelry Certificate First of all, Gem quality turquoise is hard Secondly, Low grade turquoise is soft.
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