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Chalcedony

Chalcedony

Contents

The Chalcedony gemstone is a microcrystalline and fibrous variety of Quartz. In Antiquity people believed the stone could give the owner the ability to make good speeches. Therefore, the Chalcedony is referred to as the orators’ stone.

The word Chalcedony is a generic term for various fibrous Quartz stones. The color of the Chalcedony usually ranges from clear to a bluish gray. However, contaminants can also lead to other colors, mostly brown, green, or reddish.

Achat Kristall Druse Chalzedon Chalcedon
The Agate is a variety of Chalcedony

Contaminants cause the gems to form in various tones and colors. For example, Chrysoprases contain nickel oxide, which makes them greenish. If a Chalcedony is emerald green, it contains iron oxide. Sarder or Carnelian are brown to red Chalcedony.

Other well-known varieties of Chalcedony gemstones include Agate, Chrysoprase, Heliotrope, Blood Jasper, and Onyx. The Chalcedony is cloudy to translucent and has a waxy luster. With a Mohs hardness of 6.5 to 7, the Chalcedony is almost as hard as Quartz.


Fact sheet

Name and etymology

Chalcedony, Chalcedony, Quartzine, Jasponix, Massik, Zoesite, Milkstone, and California or Blue Moonstone.

Color

Opaque-transparent, and colorless to a bluish gray.

Depending on the variety, Chalcedony can be: blue, pink, white, green, yellow, orange, brown, black or multicolored.

Mineral class

Hydroxides and oxides

Cut and form

Mostly cabochon cut (unfaceted, oval or round cut with a convex top and a flat bottom)

Value and price

Mainly the color intensity and the transparency of the gemstone determine the value and price of Chalcedony. Depending on the variety, the price can vary from a few to hundreds of dollars per carat (ct.).

Varieties / species

Agate, Blood Chalcedony, Blood Jasper (Heliotrope), chromium Chalcedony, Chrysoprase, copper Chalcedony, Onyx, Pietersite, Plasma, rainbow Chalcedony, and Sarder (Carnelian).

Birthstone / star sign

Depending on the tradition, Chalcedony governs Sagittarius, Gemini, Aquarius, and Scorpio. Among other things, it promotes purity of heart and enhances serenity.


 

 

Chalcedony’s various gemstones: Carnelian, Heliotrope, Agate, Onyx


Chalcedony varieties and species

Since there are many varieties of Chalcedony, this gemstone comes in all shapes and types imaginable. Some Chalcedonies, such as the Chrysoprase, have an intense color, while others are cloudy, or some almost transparent. On the 0ther hand, Agate is known for its striking grain. The more intense the color of blue Chalcedony, the more valuable it is. Read more about the best-known Chalcedony varieties:

Agate
Agate is the most well-known species of Chalcedony. This gem has a characteristic striped grain, and is found in various colors. For more information, see Agate in our guidebook.
Carnelian
Carnelian is a two-toned, slightly transparent to opaque gemstone that combines red or orange with white grain. Also, their colors can be intensified by heat treatment.

Chrysoprase
Chrysoprase is also a Chalcedony. It has an emerald green to apple green color. Chrysoprase tends to fade under heat or sunlight, though if the stone is kept moist, fading can be stopped or even reversed
Onyx
Onyx is a black, opaque gemstone with a white grain. It is often mistaken for the Onyx marble rock. They are processed exclusively for the production of jewelry.


Birthstone and star signs

Chalcedony is the primary birthstone of Sagittarius. It enhances inner peace and promotes trustworthiness. Depending on the tradition and type of Chalcedony, different zodiac signs are assigned to this gemstone.

  • Primary stone for Sagittarius: for inner peace and trustworthiness
  • Gemini: to increase spirituality and achieve balance
  • Aquarius: balancing, calming and relaxing
  • Scorpio: to stay strong in tough times

Properties and history

For thousands of years gemstones have been used for their healing properties. Blue Chalcedony has the property to achieve inner peace, refine oratory or language use, and increase attention. Furthermore, the gemstone has the ability to improve self-confidence and alleviate anxiety or inhibitions.

According to Hildegard von Bingen, the power of Chalcedony increases in the evening time. The stone should rest directly on the skin in order to experience its full effect. Besides protecting you from fury and promoting flexibility, the gem helps with sleep disorders such as nightmares. Moreover, it alleviates feelings of melancholy.

Healing effects at a glance:

improves

Inner peace

Rhetoric (the art of speaking)

Confidence

Attention

relieves

Anxiety and inhibitions

Fury

Melancholy

Sleep disorders such as nightmares

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