It’s actually quite simple. Diamonds, rubies, sapphires, and emeralds are precious stones, and other gemstones used in jewelry (i.e. amethyst, amber, pearl, garnet, citrine, prasiolite, jade, carnelian, agate, and many, many more) are called semiprecious. This distinction originated with the ancient Greeks, and was based in part on the relative rarity of certain stones. In fact, many semiprecious stones are just as rare and diamonds are quite plentiful. We consider semiprecious stones to be the perfect source of color and vibrance for our jewelry.