These sterling silver stud earrings each have a single sparkling 4mm ruby red cubic zirconia. With elegance achieved through simplicity, this pair of ruby red cz sterling silver earrings will look great on anyone. Rubies are also the birthstone for the month of July. The small 4mm cubic zirconia is the perfect size for children if you are looking for childrens jewelry. What better birthday present than these Ruby red CZ sterling silver stud earrings!