The month of June brings the birthstone of Pearl. Pearls are the main gems made by a living creature. A characteristic of pearls significant value is found in less than 1 in every 10,000 wild crustaceans. All pearly clams are conceived as males and become females when they are around three years old. There are three remarkable types of refined saltwater pearls: Akoya, Tahitian and South Sea. Most of the pearls you see today are pearls grown or made by humans or on farms.