These are Labradorite Hearts in the most popular size. They do have little sparkly flash of rainbow colours.
This crystal is a useful companion through change, imparting strength and perseverance because it balances and protects the aura. I definitely intuit it to help those ready for their spiritual path and / or grounds spiritual energies they have developed. Also intuited for strengthening intuition and promoting psychic abilities.
Read about how ball shape can help you. Pick the labradorite heart is for you.