The Manhattan Gemstone Pendant Necklace features a flawless, suspended on the DD rolo chain. Metal: DD Signature Brushed Gold Plated Over High-Quality Brass. Gemstone: Green Onyx (Semi-Precious). Our semi-precious gemstones are rare, ethically sourced and hand cut from naturally occurring materials, giving each individual stone its own unique color. Gemstone Diameter : 12mm Length : 18" - 20" / 46cm - 51 cm (adjustable)