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.

Click to view AGTA code.

Refractive Index 1.535-1.539
Hardness = 6.5-7 (Moh's Scale)
Specific Gravity = 2.60
Species - Chalcedony
Optic Character - aggregate

Ultrasonic: Usually safe
Steamer: Usually safe
Heat: Poor; color change may occur with heat
Chemicals that harm: Hydrofluoric acid, nitric acid.

Crystal Structure
chalcedony crystal image.
Host rock chipped away and partially polished.

Crystal system: Hexagonal fibrous aggregates, micro crystalline quartz

Blue - Africa
Lavender - United States

 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.

Common Cut Examples.
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