Sterling Silver June Birthstone Freshwater Pearl Stud Earrings The Purity Collection of Birthstones is Designed by Amore Argento A classic freshwater pearl stud earring. The perfect gift for all Life's Occassions. Every lady should have a pair of elegant single pearl stud earrings in her jewellery collection as they can be worn with anything. These freshwater pearls are 4.5mm diameter.