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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“Do all thou doest as unto Christ, as immediately dealing with Christ Jesus, as if he were looking on thee, and though on him, and fetch all thy strength from him.”
–Thomas Wilcox, A Choice Drop of Honey