Geometric Triangle Sterling Silver Studs Earrings Glam up your look with these trendy, lightweight earrings now. These earrings are characterized by their triangular shape and stud design, which means they have a post that goes through the earlobe and is secured with a backing. A triangle is a geometric shape with three sides and three angles, forming a closed two-dimensional figureTriangle stud earrings are a popular and modern choice for jewelry, suitable for both casual and formal wear.