Pearl is the birthstone for June. Pearls are an organic gemstone that form in the shells of oysters and molluscs over a long period of time. The beautiful iridescent lustre of pearls makes them highly desirable. They form in many shapes and colours, the most highly valued pearls are spherical and have an enchanting colour. Pearl jewellery inspires modesty, chastity and purity and has often been associated with the noblility and emotional strength that creates good relationships.