Sterling Silver White Freshwater Cultured Pearl and Crystal Necklace The 6.0-6.5mm pearl size is a perfect gift for older teens or those between 15 and 24 years old. They are also great gifts for a sixteenth birthday but are also an excellent graduation gift. 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. Imported