Oval Blue Tourmaline Earring Studs in 14k White Gold. These lovely stud earrings feature 2.23 carats of oval cut blue tourmaline finished in 14K white gold. The tourmalines have a dark, ocean blue hue. Set in four prongs, the two (2) 1.115 carat tourmalines are mounted securely on classic stud backings. Finished in shimmering 14K white gold, these studs are a classic set that look beautiful on everyone!