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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“Trust in the LORD with all your heart and lean not on your own understanding; in all your ways submit to him, and he will make your paths straight.”
– Proverbs 3:5-6