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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“Keep your lives free from the love of money and be content with what you have, because God has said, "Never will I leave you; never will I forsake you."”
– Hebrews 13:5