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. In the context of birthstones, Chalcedony has been found to be the May birthstone, even historically. And it is still a zodiac stone for Gemini. Certain chalcedony varieties are also gifted as presents on wedding anniversaries.
