Nilly Silver Earrings with Pearls. Cultured freshwater pearls are grown in lakes and ponds. Pearl grows from two to five years. All our pearls have grown under natural conditions, without the use of the kernel, and consist only pure natural pearl.The jewellery complies with Lithuanian Assay office standards of quality and international quality standards. 7 mm - weight 2.49 g., 5 - 7.00 mm.8 mm - weight 3.06 g., 7.5 - 8.00 mm.9 mm - weight 4.22 g., 8.5-9.0 mm.10 mm - weight 5.57 g., 9.8 - 10.00 mm.