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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“We all, like sheep, have gone astray, each of us has turned to his own way; and the LORD has laid on him the iniquity of us all.”
– Isaiah 53:6