14k Gold Cushion-Cut Checkerboard Created or Genuine Stud Earrings Classic and versatile stud gemstone earrings, ready for anything the day brings. Stud earrings feature 8mm London Blue Topaz center stones. High polished 14k Yellow Gold four prong setting and butterfly backs. Blue Topaz is December's birthstone. The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture.