Love opal? Petite, sterling silver children's heart necklaces in lab-created Opal (blue,) known as Nano-opal. Also available in white and pink. The faceted heart measures 6mm x 6mm. Chain measures 39cm or around 15" and will suit from around age 3 to 10. In our Earrings Category, you can find blue opal children's stud earrings to match.