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 must not be proud of our bodies, because the matter is from the earth, yet not dishonour our bodies, because the mould and shape are from the divine wisdom.”
–Matthew Henry, Commentary, Job 10