Always fun when a new find is found. And these are Larvikite Hearts which are also called Norwegian Moonstone although not a real moonstone. Reason is the lovely flashes like rainbow moonstone which actually is white labradorite! Dimensions are for the heart on the right.
Healing Properties of Larvikite (Lavakite. Lavikite)
It is excellent for achievement of goals and learning, enhancing memory capacity and understanding. Use it to opens one’s subconscious “teaching on higher levels” so excellent for students. This crystal enhances youthfulness and vitality. It can also be useful for lucid dreaming, stimulates inner visions and psychic abilities. Great if wishing to do Elemental magic and to connect with Nature spirits.
And here is information about the heart shape.