Opaque Ruby 2mm (July Birthstone) Round Stud Earrings with Sterling Silver Posts and Sterling Silver Pushbacks. Handmade, hand-selected, real Ruby gemstones, placed in 2mm Round sterling silver studs with sterling silver pushbacks. Color is brilliant in any light! Both gems were selected by me to be as close in color and vibrancy as possible! Note to Seller: Ruby2m1A and 2m2A