This necklace is silver plated and made of raw black kyanite. 
Black Kyanite Healing Properties:
The high vibration and rapid transfers of energy from Kyanite create pathways where none existed before. Like a universal bridge, it is an extraordinary crystal of connection, opening the mind centers, enhancing telepathic and psychic abilities, bridging gaps in all communication efforts, and providing a link for transmitting or receiving healing energy. It immediately aligns the chakras and subtle bodies, bringing tranquility and a calming effect to the whole being. It is an exceptional stone for transitioning into deep meditative states. Kyanite is one of the two minerals on the planet that neither accumulates nor retains negative energy, and therefore never needs cleansing. Kyanite's energy is unlimited in application, making it an excellent stone for metaphysical purposes, and it may be used for cleansing and clearing other crystals.