The Signature Midi Knockout Pendant features a multi-faceted, brilliant-cut gemstone suspended on a fluid box chain. Our silicone slide closure allows you to gently pull the chain and adjust it to your desired length. Gemstone: Crystal Quartz (Semi-Precious). Our semi-precious gemstones are rare, ethically sourced and hand cut from naturally occurring materials, giving each individual stone its own unique colour. Note: stone colour per piece may vary. Length: 18" / 45cm (adjustable) Gemstone Diameter: 7mm See our size guide here .