Dean Davidson Mercer Gemstone Studs - Midnight BlueEmbrace a touch of everyday color with these Celestial Blue set studs that can be worn both horizontally or vertically on the lobe. Gemstone: Celestial Blue (man made). This rich blue synthetic gemstone is handcrafted as a doublet, a technique that lends it extra iridescence through a mother of pearl backing. Metal: DD Signature brushed gold and high polish edges over high quality brass. Diameter: 0. 5" 12 mm MATERIALS Our jewelry is handcrafted using