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Natural Chalcedony

The name chalcedony is applied to any fine grained quartz with a fibrous or crypto- crystalline microstructure. It often displays some kind of distinctive banding. The name agate is used for the sub variety of chalcedony which displays distinctive banding with successive layers differing in color and degree of translucency.

  • There are 49 Chalcedony gemstones available at
  • Chalcedony(s) are organized in the following categories: CalibratedSingle,  gemstones.
  • Our most expensive Chalcedony is USD 90.88 and largest Chalcedony weight is CTS 59.25.
  • Our cheapest Chalcedony is USD 2.06 and smallest Chalcedony weight is CTS 1.36.

Find your Chalcedony

Our Chalcedony(s) are available in various shapes, sizes and colors. 49 Chalcedony(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Shape Length (mm) Width (mm)
Category Weight (cts) Price (USD)
Color range
violetish blue
bluish purple
bluish violet

Chalcedony Profile

Color information: grayish, purple, white, green, blue, lavender, yellow, brown.
Refractive Index: 1.530 - 1.539
Chemical Composition: SiO2
Hardness: 6.5
Density: 2.57 2.64
Crystal Group: Hexagonal
Ocurrence: Brazil, U.SA. Germany, India, Uruguay, Austarlia, Egypt, Italy, Scotland, South Africa, Namibia, Madagascar, Mexico, Tanzania, and many other localities throughout the world.
Sign of the Zodiac: N/A
Month of the year: N/A
Chalcedony Chalcedony Chalcedony Chalcedony
The individual fibers of chalcedony and its subvarieties are not physically separable; they occur as parallel or near parallel aggregates or as spherules. The fiber direction is perpendicular to the layering while the banding is parallel to the free surface or cavity in which the chalcedony occurs.

The hardness of chalcedony is variable around 6.5; somewhat lower than that of more coarsely crystallized quartz which has a hardness of 7. The specific gravity also varies according to porosity, water content, and the presence of other substances. The normal range is 2.57 2.64. Chalcedony is about 90 99% SiO2. Brown and reddish varieties are higher in Fe2O3.

Chalcedony fractures easily across the banding to give a splintery surface with a waxy luster. Most chalcedony is somewhat pale and grayish in appearance.

Chalcedony is deposited in a variety of environments and deposition is commonly at low temperatures. Light colored material is often found as a late hydrothermal deposit or an alteration product in acidic or basic igneous rocks, tuffs and breccias. It is very common as crusts of vein or cavity fillings.

The most prized of the chalcedonies are the translucent green stones known as chrysoprase and the brown iridescent and colorful stones known as fire agates. Other important kinds of chalcedony include bloodstone, lace agate, sard, iris agate, onyx, and carnelian.

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Finest gems/
Tsavorite Single
From our finest gemstones collection
Tsavorite Single Octagon Slightly included
Size: 10.10 X 7.80 MM
Weight: 4.770 CTS
Shape: Octagon
Clarity: Slightly included
Usually ships within 24 hours
USD 15264.00

Deal of the Day/
Amber Single
limited time offer, ref# YAR136aa
Amber Single Fancy Transparent
Size: 21.90 X 19.36 MM
Weight: 8.920 CTS
Shape: Fancy
Clarity: Transparent
Usually ships within 24 hours
10 % OFF, YOU SAVE 17.00 USD
USD 153.00

Today’s Trade/
Best Selling Gems:
Sapphire Sapphire
1551 Sapphire ’s available
Browse gems | Learn More
Spinel Spinel
379 Spinel ’s available
Browse gems | Learn More
Alexandrite Alexandrite
309 Alexandrite ’s available
Browse gems | Learn More
Tanzanite Tanzanite
434 Tanzanite ’s available
Browse gems | Learn More
Zircon Zircon
242 Zircon ’s available
Browse gems | Learn More
Gemstone Variety: Hits Index
Going Down Amber -3076 -0.1%
average price USD 174.55 per item
Going Down Sapphire -425 +-0.0%
average price USD 355.24 per item
Going Down Alexandrite -563 -0.1%
average price USD 1716.56 per item
Going Down Anatase -136 -0.1%
average price USD 185.71 per item
Going Down Turquoise -664 -0.3%
average price USD 53.43 per item
See more real time gem reports.
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Gem Library /
Gems Legend and  Lore This month birthstone: Alexandrite, Pearl
More from the Gem Library about Birthstones.
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May 21 – June 20
Dual nature. You can go in many directions. Your zodiac stone...more

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