According to wiccalight.co.za:
Abalone shell has been used for centuries in jewelry and carvings. Nicknamed the sea ears, the Abalone's flattened, oval shape with iridescent interior was used by the Native Northwest American Indians as a natural vessel for cleansing, offerings and prayers. Embracing the colors of the ocean, the shell displays iridescent colors in its blues, greens, purples and yellows. This unique shell embodies all the aspects of the water element including love, beauty, gentleness, caring, comfort, peacefulness, delight and solace. It is soft to the touch from repeated tumbling in the sand and water. Abalone is useful for handling and calming emotional situations and is very soothing to the mind/body. When working through any emotional situation, have abalone nearby as it is believed to be beneficial and promotes cooperation. Abalone is associated with all the Chakra energies. In particular, it seems to work the best on the Solar Plexus Chakra, stimulating that gut feeling. Abalone is especially good for the Heart Chakra, as it gently clears the heart of fear, sorrow and negative emotions. Abalone allows your intuitive resources to stimulate psychic development and intuition through the Third Eye Chakra.