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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“A saint cannot do evil before men but he gives opportunity for sinners to speak evil of God. If there be any spots on a Christian's coat, the world will soon spy them.”
–George Swinnock in Works