Freshwater Cultured A-Quality 8.5-9mm Pearl Earrings Simple stud earring featuring freshwater cultured pearl affixed to sterling silver backing 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.