Properties: For comunication and blocking negativity. Works on your throat chakra. Blue obsidian is also said to aid divination, psychometric and psychic development.
Dimensions: Approximately 2.5cm x 1.5cm. Price is per crystal.
Disclosure: If you're worried about your health always see your doctor first. There are no guarantees with crystals, but they may enhance your life. Photo and size are a guide.