Ross-Simons - 8.5-9mm Cultured Pearl Mermaid Pendant Necklace in Silver. 18". Crafted in textured and polished sterling silver, our free-spirited mermaid pendant holds a special treasure: a luminous 8.5-9mm cultured freshwater button pearl. Wear our sea-inspired pendant necklace in celebration of your own unique and playful personality. Cable chain with a 2" extender. Lobster clasp, white pearl mermaid pendant necklace. Pearl birthstones are the perfect gift for June birthdays.