Freshwater Cultured Pearl Stud Earrings with Swirl Setting in 14kt Yellow Gold Classic stud earring with freshwater cultured pearl framed in swirling nest of 14k yellow gold The natural properties and process of pearl formation define the unique beauty of each pearl. The image may show slight differences in texture, color, size, and shape. Carved rings are naturally occurring imperfections that result from the pearl rotating inside the mollusk as it is growing. They define the unique beauty of each pearl and may vary in size, number, and depth per pearl.