Onyx. Chalcedony in parallel layers of different shades of color. It is used for making cameos, the figure being cut in one layer with the next layer as a background. It is stained black and used to make mourning jewelry.

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“I have told you these things, so that in me you may have peace. In this world you will have trouble. But take heart! I have overcome the world.”
– Jesus, John 16:33