Pearls are the only gem made by an animal. Freshwater pearls come from mussels in rivers and lakes while saltwater pearls come from oysters in the ocean. Their existence relies on clean water so you are helping to nurture the planet by wearing and giving them as gifts! Pearls are alluring, timeless keepsakes, classic so they make great gifts for weddings, graduations, anniversaries. Pearls are the June birthstone.