Gemstone Cabochons Ob - Ony

• Obsidian

• Onyx

• See Gemstone Pendants

Obsidian Cabochons

Obsidian is dense volcanic glass usually black in color. Inclusions and bubbles add color and patterns to some types of obsidian. It is often formed in rhyolite lava flows when the lava cools quickly enough to prevent crystal formation. Glass has no regular structure and fractures in round smooth sections. These can form an extremely sharp edge and obsidian was used by many cultures for knives and arrowheads. Today obsidian blades are used in heart surgery, and have a cutting edge much sharper than surgical steel scalpels.

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Item 1844

Snowflake Obsidian

Item 1845

Spider Web Obsidian

Item 1587

Onyx Cabochons

Onyx is a cryptocrystalline form of quartz. Bands are usually white, tan and brown but can be a wide variety of colors. Sardonyx has red bands of color. Black Onyx is less common than banded Onyx. Used for cabochons, beads and cameos. Onyx has been used by a variety of Ancient cultures and civilizations.

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Item 1693

Item 1694

Item 1654

Item 1096