Smoky Quartz Gemstone Information Information * Loose gemstones * Jewelry links Smoky Quartz was often used for Victorian mourning jewelry. It is named cairngorm after the mountains in Scotland where it is found to be brown to black in color. The color comes from natural radiation exposure. Smoky quartz is also found in the Swiss Alps where different altitudes produce different colors and tones. View examples of cut smoky quartz below and prices in our store section.   ENHANCEMENT CODE E Click to view AGTA code. PROPERTIES Refractive Index 1.544-1.533 Hardness = 7 (Moh's Scale) Specific Gravity =2.66 Species - Quartz Optic Character - Double Refraction. WARNINGS FOR CARE Ultrasonic: Usually safe Steamer: Risky Heat: Poor; color change may occur with heat; may fracture under abrupt temperature changes Chemicals that harm: Hydrofluoric acid, ammonium fluoride.   Crystal Structure Crystal system: Hexagonal (trigonal), compact. MAJOR SOURCES Brazil, Madagascar, Sri Lanka, South Africa, Uruguay Birthstones  January  Garnet February Amethyst March Aquamarine April Diamond May Emerald June Pearl/Alexandrite July Ruby August Peridot September Sapphire October Opal/Tourmaline November Topaz or Citrine December Blue Topaz or Zircon Antique. Antique Cushion. Straight Baguette.   Emerald cut.   Round cut. Marquise cut.   Oval shape. Pear Shape.

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