<span><em>Define your style with stack-and-layer essentials from our Pure Collection. Create the perfect look to show off your personality.</em></span> Enjoy a pop of color from this dainty blue diamond single stud earring. Crafted in 14kt yellow gold, this simple pushpin style features a flat back that won't poke or jab while you're taking a quick nap or getting a full night of beauty sleep. Insert the backing first into a pierced ear, then slide the front post inside to secure. Designed for 24/7 wear, this easy earring is ideal for an active lifestyle and can be worn without worry during workouts, travel and all of your daily activities. Suitable for most standard ear piercings. Blue diamond single stud earring. Our blue diamonds are natural diamonds that have been treated which causes the color change and then heated to hold the color. The color change process is permanent.