Chalcedony occurs in different colors, including white, pink, gray-blue, and red. It is a common gemstone and can be found throughout the world. It comes in all sizes and is sometimes banded, often seen as a geode or small tumbled stone.
Pure Chalcedony is also known as Sard or Carnelian.
All these gemstones are part of the vast Chalcedony family.
It’s also common for the single-color variety to be sold under the Chalcedony name. The rest of this group is given unique and specific names, like Onyx, Carnelian, Jasper, and Heliotrope.
The name Chalcedony is derived from the ancient Byzantine port city of Chalcedon, known today as Kadikoy in Turkey.
Notable Chalcedony occurrences are in the USA, Russia, Namibia, India, New Zealand, Morocco, Mexico, Brazil, and Turkey.