February Birthstone Necklace A celestial night sky shines in 18k gold plate against a gunmetal background, creating a meaningful pendant necklace. An amethyst accent, February’s birthstone, symbolizes spirituality, peace and prosperity. 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" Extender Pendant size: 16MM 18KT Gold/Gun Metal Plated Brass