Chalcedony was historically the birthstone for May. It is one of the zodiac stones for those born under the sign Gemini, between May 21 and June 20, when the Earth is approaching summer.
Chalcedony is known as the Speaker's Stone, the stone of one who must measure his words. It encourages reflection and meditation while stimulating growth and learning. Its gentle radiance prepares us for action but helps to hold back words we might regret. It promotes good will, opening the mind to new ideas, instilling feelings of benevolence and generosity. A stone of peace and peace-making, it brings joy, love and kindness to its wearer, calming one to reduce fear, anger and self-doubt.
Chalcedony comes in different colors and varieties. Its name may be derived from the Greek port city of Chalcedon.
Chalcedony's affirmation is: "I speak my truth with integrity."