Give her some extra motivation to keep training & show her how proud you are of her half marathon accomplishment. This 13.1 Believe it , Achieve it Necklace, earrings, & chains are all crafted of the finest .9254 sterling silver. This is another Milestones Exclusive design. The chain comes in 2 styles & your choice of 16", 18" or 20" lengths. Pendant measures 22mm in diameter (outside measurement), earring charms measure 14mm in diameter. Cubic Zirconia posts are sterling silver & measure 5mm in diameter. Earring posts are hypoallergenic. Save big by purchasing this 13.1 half marathon necklace & earrings as a set. However, the necklace & earrings are both available individually as well. Half Marathon Believe & Achieve Necklace & Earrings Set