The name Chalcedony is derived from the Greek port city of Chalcedon (nowadays Kadköy, Turkey). Varieties of Chalcedony were incorporated into jewelry and carving by ancient civilizations in Egypt, Greece and Rome. It is a crypto crystalline form of quartz, transparent to opaque, depending on the structure and type. Blue Chalcedony is a creative stone and stimulates the ability to learn new languagesand improves memory. It gives a feeling of airiness and optimism. It is said that this stone improves self-perception and improves the immune system.