I first made these for a friend who lost his wedding ring on a rafting trip, oops! Both are Argentium sterling silver with a 2.5mm strip of sterling silver/14K white gold Mokume Gane. The plain band is 7.5mm wide; the concave band is 9mm wide and features a 2mm flush-set white sapphire in an 18K yellow gold circle. Conflict-free diamonds are also available. Made from 100% recycled metals.