These beautiful pendants are Swedish blue. Found only in Sweden, these one-of-a-kind pieces are slag -- the byproduct of smelting metal ores -- from the 16th and 17th centuries. They were created with time, as the slag changed into a glasslike substance. This makes each piece unique: no two will have the same shape, shading or markings. You can wear this gorgeous jewelry knowing it is a unique piece of Sweden's history. Our Swedish blue pendants are offered on an adjustable 21 inch chain. They come gift boxed with jeweler's paper.