In gemology, the concept of "precious" and "semi-precious" came out decades back from the trade to help separate expensive (precious) gemstones from inexpensive (semi-precious) ones.
There are many gemstones that fall under semi-precious category. Some popular semi-precious gemstones are: aquamarine, chalcedony, chrysocolla, fluorite, iolite, jade, kyanite, malachite, opal, peridot, quartz (citrine, amethyst, rose quartz, tiger’s eye), rhodochrosite, rhodonite, sodalite, kunzite, topaz, tourmaline, turquoise, tanzanite etc.
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