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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“Let us not give up meeting together, as some are in the habit of doing, but let us encourage one another – and all the more as you see the Day approaching.”
– Hebrews 10:25