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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“God often bestows temporal prosperities on the wicked, to show how lightly he esteems what the world is so dazzled with; but crosses he reserves for his own, whom he would humble under his Almighty hand, and make them the objects of his delight.”
–Fenelon