18K White Gold Round Double Row Removable Jackets for Stud Earrings Only the jackets are sale for stud earrings. Inner Diameter is 5 mm and Outer diameter is 9.5 mm. Can be fit with 4 mm Each Round shape Center Diamond. Blue Sapphire is very dark blue in color - Color varies from photo. All our diamonds are conflict free. Color stone may have inclusions and external blemishes visible to the naked eye Dazzlingrock 90 Day Warranty - We stand behind our products. If you lose an accent stone or your setting is damaged during NORMAL wear, we will fix it for FREE. Please read our About us page for more info