A form of microcrystalline quartz, the chalcedony family of stone encompasses a dozen different colored gemstone varieties. Some of these varieties include agate, carnelian, chrysoprase, onyx, jasper, blue chalcedony, pink chalcedony, and aqua chalcedony. In case you are thinking about whether chalcedony are real gemstones or not, well, yes, they are. They are semi-precious gemstones.