Mahogany Obsidian Heart Pendant

Mahogany Obsidian heart pendant with a 925 silver bail.

Obsidian
Obsidian is a volcanic glass, it was formed when lava of specific mineral composition, rapidly cooled.
It has a black colour but will look brownish when held against the light, which will also reveal mineral inclusions and fractures.
Obsidian has been used to produce tools and weapons during the stone age, due to is sharp edges while today, it is commonly used for jewelry and art.

Tumbled Stones
These are stones that were tumble polished in a rock tumbler.
The rough stones are put into the tumbler with abrasive grit where they are tumbled for weeks, during this time the sharp edges are rounded off.
During the process, ever finer grits are used and so the stones are slowly getting a smooth and shiny surface.
The final stage of the tumbling process is using a special polishing powder instead of abrasive grit to polish the stones to a mirror finish.