May Birthstone Necklace A celestial night sky shines in 18k gold plate against a gunmetal background, creating a meaningful pendant necklace. An emerald accent, May’s birthstone, symbolizes wisdom, abundance and mercy. Set on a 16” chain, this birthstone necklace has an extender finished with a sparkling gold star for added length and delicate detail. 16" with 3" extension chain Pendant size: 16MM 18KT Gold/Gun Metal Plated Brass