Silver Butterfly Stud EarringsButterfly Stud Earrings These butterfly shaped stud earrings are crafted from solid 925 sterling silver. The 925 stamp signifies that the metal is composed of 92. 5% pure silver, which is alloyed for strength and lasting wear. Each stud presents a detailed butterfly silhouette, measuring 9 mm at its widest point and 7 mm in length. The earrings have a slim 1 mm depth, allowing them to sit neatly against the earlobe.