Pearls are the most valuable of all organic gemstones. Prized for 6000 years. Pearls chemical makeup varies by region & environmental factors but the basic formula is irritant is coated (mother of pearl)^
SHAPE this photography shows literally a natural shape. It is a shoot of a rock wall somewhere besides the ocean and one hole inside the rocks is amazingly shaped like heart. The light turquoise of the ocean makes this shape even more visible.