Mother of Pearl round semi-precious stone beads. These 4mm gemstone beads are a white & cream colour, formed from the shell of oysters they are believed to have protective properties. Mother of Pearl is the birthstone for June. These gemstone beads are sold either singularly or strung on a 16 inch/40cm strand of monofilament which contains approximately 100 4mm beads. They are a very versatile size and ideal for bracelets and tiaras.