The inlay work is not pietra dura, but a lapidary of precious and semiprecious gemstones. Semiprecious stones such as carnelian and amethyst may be used, as well. Both base and casket are elaborately inlaid with precious and semiprecious gems. Many precious and semiprecious stones are used for jewellery. Both the base and casket are elaborately inlaid with precious and semiprecious gems. Marble quarries, semiprecious stones, and oil shales were all exploited. The other minerals extracted are rock salt and semiprecious stones. "Calcedonio" is a marbled glass that looked like the semiprecious stone chalcedony. Many different colored stones, particularly marbles, were used, along with semiprecious, and even precious stones. Many of the materials used were semiprecious and oddly-shaped stones and pearls. It is rich in deposits of precious and semiprecious stones. Deposits of boron, sodium chloride, carbonates, fluorite, precious and semiprecious stones have also been reported. She pioneered the technique of setting precious stones in semiprecious materials. Some shells used in this way are decorated with metal and semiprecious stones. India also contains many stones which are semiprecious like-zoisite, apophyllite, cavansite, muscovite mica, almandine, etc.