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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“Do you not know that your body is a temple of the Holy Spirit, who is in you, whom you have received from God? You are not your own.”
– 1 Corinthians 6:19