Onnea Gold Tone Crescent Bar Collar Necklace Onnea: My ally in fashion. Gold Tone Crescent Bar Collar Necklace Chain/Pendant: 16"+2"/3.5" Simple and elegant, this short chain necklace features a curved bar. Delicate and beautiful for everyday wear Material: Metal, nonmetal, surface coating testing method with reference to CPSC, and analyzed by AAS.