There are a number of different varieties of the gemstone Chalcedony, which are often referenced as gemstones in their own right. These Chalcedonies include but are not limited to Agate, Black Onyx, Bloodstone and Jasper. Other examples are generally broken down further and named according to the color/s they exhibit.

Birthstone Month:
Chalcedony is not associated with any particular birthstone month.

Chalcedony is not associated with any particular zodiac sign.

Chemical Symbol: 

Chemical Make-up: 
Chalcedony is a Silicon Dioxide and a cryptocrystalline variety of the mineral Quartz.

History & Lore: 
The name Chalcedony is widely believed to be a direct reference to an ancient Greek settlement in Asia minor.  Whilst this settlement was known as Chalkedon, modern English usually presents this as being spelt Chalcedon, hence the forming of the name Chalcedony for this gemstone variety.

Chalcedony has been in use almost as long as the earth has been inhabited and some of the earliest primitive tools created by man’s ancestors some 2.5 million years ago were made of various types of Chalcedony.  Owing to the huge number of varieties available, Chalcedony soon graduated from being used just for tools and eventually became a popular material for decorative purposes and jewelry adornments.

Chalcedonies are believed to have been considered sacred stones by Native American Indians and they were often used for ceremonial purposes, particularly for promoting stability within the tribes.

Chalcedonies are believed to promote charity, improve relationships and enhance the wearers ability to offer kindness to others, as well as negate feelings of hostility, negativity and irritability. Chalcedonies are also credited with having the ability to promote emotional balance and to improve the wearers vitality and stamina.

Chalcedony deposits and varieties are distributed extremely widely and can be found almost anywhere on earth. Particular regions and localities are associated with different varieties. Chalcedony, regardless of variety is a modestly priced gemstone and in most cases cost is actually determined much more significantly by how well the stone has been fashioned / cut as opposed to the actual weight / color / properties of the gemstone.

Chalcedony deposits occur worldwide.

Chalcedonies varieties are rated at 6.5 – 7.0 on the Moh’s Scale of Hardness, making all Chalcedony suitable for most jewelry applications. The sheer amount of colors and individually identifiable varieties that Chalcedonies are found in is immense, and because of this, different varieties of Chalcedony have been awarded different descriptive names.

Chalcedonies are found in a number of different colors including, black, blue, brown, colorless, gray, green, orange, red, violet, white, yellow, or any combination of the aforementioned colors.

All varieties of Chalcedony can be acquired easily and at affordable prices. Whilst all varieties are modestly priced, different types of Chalcedony have their own individually specific desirable traits. In order to learn more about your chosen variety of Chalcedony, search our education further or email a Support Representative.

Common Cuts: 
Cut is a very crucial trait and has a huge effect on the overall look and perceived value of Chalcedony. Chalcedony varieties are often found carved into decorative items and in jewelry Chalcedony is most commonly found fashioned into beads, or cut into Cabochon form, but many can actually be cut into most of the common gemstone shapes/cuts.

Routine Enhancements: 
Chalcedonies are routinely dyed in order to improve and enhance color.

Care & Cleaning: 
Chalcedony varieties are generally best cleaned using warm soapy water and a soft brush. As with most gemstones, Chalcedonies should be kept away from household chemicals and from prolonged exposure to extremes of heat as this can cause damage or permanent changes in coloration. Chalcedonies should be kept in a fabric-lined box away from other jewelry items in order to avoid scratching.


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