Aqua Chalcedony Pendant. $30.00. This pendant is 92.5 silver, with a high-quality blue chalcedony piece. Calmness, balance, centeredness, inner knowledge, and communication. Strengthens and heals the vocal cords. About 0.9 inches in length, 0.6 inches in width, and 0.1 inches in thickness. Due to mother nature’s creative liberties, the color varies ever so slightly between pendants.