The Hatton necklace collection combines brushed stainless steel with natural stones, elegantly designed to coordinate with the Hudson Ring collection. - STONE: Black Onyx (strength, perseverance, and the ability to overcome challenges) - SIZE: Adjustable - MATERIAL TYPE: 316L stainless steel, Black PVD plated - FINISH: Brushed - DURABILITY: Waterproof, heatproof & sweatproof