Sterling Silver 2 in 1 CZ Crystal Twinkle Star Crescent Moon Stud and Ear Jacket Earrings Set Stud and jacket earrings can be worn alone or together. When stud is inserted into the earring jacket, it holds it securly in place outside of the earlobe. Stud Dimensions: 0.24" x 0.24" (6mm x 6mm), Jacket Dimensions: 0.74" (12mm) wide, Backing Type: Push Back Post. Material: Premium Genuine .925 Sterling Silver, Rhodium plated, Stone: Cubic Zirconia CZ Crystal. Elegant Gift Jewelry Box Included, Free US Shipping, 100% Satisfaction Guarantee