Chalcedony Gemstone Information Information * Loose gemstones * Jewelry links Chalcedony is named for the ancient seaport of Chalcedon. In the third or fourth century AD, Greek seafarers wore chalcedony to avoid drowning. It was once believed that someone seeing the nocturnal phantoms took in disease through their eyes, but the "alkaline" content of chalcedony could remove it. The Bghai tribe in Burma believed that both good and bad spirits lived in their chalcedony fetishes. View examples of cut chalcedony below and prices in our store section.   ENHANCEMENT CODE N Click to view AGTA code. PROPERTIES Refractive Index 1.535-1.539 Hardness = 6.5-7 (Moh's Scale) Specific Gravity = 2.60 Species - Chalcedony Optic Character - aggregate WARNINGS FOR CARE Ultrasonic: Usually safe Steamer: Usually safe Heat: Poor; color change may occur with heat Chemicals that harm: Hydrofluoric acid, nitric acid.   Crystal Structure Host rock chipped away and partially polished. Crystal system: Hexagonal fibrous aggregates, micro crystalline quartz MAJOR SOURCES Blue - Africa Lavender - United States   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 Cabochon is the popular cut used in jewelry for chalcedony. Cabochons are smooth polished surfaces not faceted. Click image for gemstone price lists. Round Blue Chalcedony Cabochon. Oval Blue Chalcedony Cabochon. Antique Square Blue Cabochon. Antique Cushion Blue Cabochon.   Round Lavender Cabochon.   Oval Lavender Cabochon.   Antique Square Blue Cabochon.   Trillion Shape Lavender Cabochon.

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