Dean Davidson's best-selling earrings, worn by Meghan Markle. The Signature Midi Knockout Studs feature multi-faceted, brilliant-cut gemstones that make an impact for both day and night. Gemstone: Rainbow Moonstone (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. Gemstone Diameter: 0.2"/ 7mm