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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“Hope in this life is a perishing thing, but the hope of good men, when it is cut off from this world, is but removed like a tree, transplanted from this nursery to the garden of the Lord.”
–Matthew Henry, Commentary, Job 19