Glossary of Gemstones: O


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Obsidian is a natural glass of volcanic origin that is formed by the rapid cooling of viscous lava. Obsidian has a glassy lustre and is slightly harder than window glass.

The most common color of a obsidian gem is black, but it can also be found in light brown, brown mottled with black, and black with a beautiful golden or silvery sheen. Snowflake obsidian is dotted with white patches and most prized obsidian is the rainbow obsidian variety with purple, green and gold bands of sheen.

Healing ability:

Obsidian relieves pain and circulation. Its energies can help those hands & feet that seem to be constantly cold.

Spiritual power:

Obsidian can help protect against the negativity of others and has a grounding influence helping one to stay focused in the moment. It can also help to stimulate analytical capabilities and precision, and can help promote a forgiving attitude and release of grievances.


Onyx is chalcedony quartz and has a fine texture. The colour of the onyx is black but some onyx also displays white bands or ribbons against a black or brown background and this variety is known as sardonyx. Most commercially available black Onyx available today has its colour enhanced in order to increase its depth.


Onyx is the birthstone of Leo (Lion): July 23 – Aug 22.

Wedding anniversary:

Onyx is the anniversary gemstone for the 7th year of marriage. Black Onyx is the anniversary gemstone for the 10th year of marriage.

Healing ability:

Onyx is used to strengtheners the heart, kidney, nerve, capillary, hair, eye and nail. Onyx is said to help one with sleep, eliminates apathy, stress and neurological disorders.

Spiritual power:

This gemstone eliminates negative thinking it is believed to sharpen the wits of the wearer. Onyx is said to bring spiritual inspiration and black Onyx is used to help you change your habits.