Each color of chalcedony has its own attributes:

Blue chalcedony helps one overcome jealousy and despair. It also represents both aspects of communication: the ability to listen and understand, as well as the ability to communicate clearly. Promoting awareness, it fosters clearer psychic vision.

On the physical side, blue chalcedony promotes overall good health. Used to counteract the emotional and physical symptoms of menopause, this stone helps alleviate symptoms of Alzheimers, as well as respiratory ailments.

Yellow chalcedony brings more light into the physical, emotional and mental bodies and connects one to a higher intelligence and spirituality. It also serves as a stress reducer.

On the physical side, yellow chalcedony stimulates and activates glands -- in particular, it brings light into the thymus.