June counts three gems as birthstones, Pearl, Alexandrite and Moonstone:  Of these three, pearl is by far the most common, and therefore most often used in June birthstone jewelry. But if you are looking for a perfect birthstone jewelry piece for someone with a June birthday, any of these three stones will make an unusual, unique gift  that she is sure to treasure for years and years to come.
Pearl
Historically, pearls have been used as an adornment for centuries. They were one of the favorite gem materials of the Roman Empire; later in Tudor England, the 1500s were known as the pearl age. Pearls are unique as they are the only gems from living sea creatures and require no faceting or polishing to reveal their natural beauty. In the early 1900s, the first successful commercial culturing of round saltwater pearls began. Since the 1920s, cultured pearls have almost completely replaced natural pearls in the market.
The pearl is the best-known of June’s three birthstones, as it is also one of the most popular and best-selling gemstones in the world. Of course, a pearl is not really a gemstone, as it is not produced in the earth like other gemstones. Instead, it is a calcium carbonate deposit produced in shell of a mollusk—but is still known worldwide as one of the most valuable and sought-after pieces of jewelry for its sheen and elegance. Pearls, whether they are worn as earrings or in a long necklace, are a symbol of luxury and elegance like no other gemstone. The pearl’s unworldly beauty and humble origins prompted many ancient civilizations to create fanciful myths about the pearl: the Greeks referred to pearls as the tears of joy that the goddess of love cried as she was born from the sea, ancient Arab legend attributed the pearl’s origin to oysters drinking moonlit dewdrops, while the ancient Chinese said pearls came from the brains of dragons.