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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“He himself bore our sins in his body on the tree, so that we might die to sins and live for righteousness; by his wounds you have been healed.”
– 1 Peter 2:24