Kristina: 1.7ct 10mm Halo Jacket & 6mm Ice on Fire CZ Basket Stud Earring Set 925 Silver, 0816 The Kristina features our brand new 10mm Russian Ice CZ earring jacket paired up with a matching set of our 6mm Russian Ice CZ studs. Oh so gorgeous! The included stud earrings feature a pair of sparkling 6mm, 0.75 carats each, Russian Ice on Fire CZ gemstones. The Kristina jacket works great with a variety of studs and gemstones. Metal components are solid 925 Sterling Silver with a protective finish. Overall width is 10mm so it's just under 1/2 inch.