Lapis lazuli:

It is known for its deep blue color and is often used in crystal healing. In the practice of chakra healing, lapis lazuli is often associated with the throat chakra, which is located in the throat area. The throat chakra is associated with communication, self-expression, and truth. Therefore, it is believed that lapis lazuli can help to balance and energize the throat chakra, promoting feelings of self-expression and communication.