Treat your friend with a December birthday to a matching gift set that features their birthstone. Made from 9ct yellow gold, the pendant and stud earrings in this set all display blue zircon. The stud earrings measure 7.5mm high and the pendant measures 21mm high (including bail attachment) and 11mm wide. Choose to purchase the pendant with no chain or with a chain that measures 16, 18 or 20 inches in length.