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either of two semiprecious gemstones: a violet-coloured variety of ruby spinel (q.v.) or iron aluminum garnet, which is most abundant of the garnets. Specimens of the garnet, frequently crystals, contain up to 25 percent grossular or andradite and are commonly brownish red; gem-quality stone is deep red and slightly purple. Almandine, the so-called precious garnet, is most often faceted for rings. Cabochon-cut (rounded, convex polished surface), deep red almandine is called carbuncle; its base is often hollowed to lighten its colour. When rutile needles are included in the almandine, the cabochons often show a four-rayed asterism (star-shaped figure)