Geometric Triangle Gold Plated Studs Earrings Complete your outfit with these graceful, shining 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.