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: Iridescent Pearl (Man-Made). This pearlescent gemstone is handcrafted as a doublet, a technique that lends extra radiance through a mother-of-pearl backing atop a crystal quartz gem. Metal: DD Signature Brushed Gold Plated Over High-Quality Brass. Gemstone Diameter: 7mm