Small Viking trefoil brooch. Based on a find from Oppland, Norway. 925 silver (Sterling Silver), approx. 3.6 x 3.4 cm. Weight of the brooch approx. 12 grams. Such trefoil brooches are part of the typical Viking women's costume as garment brooches. For example, they were used to close shawls or to attach chains with jewelry, needle containers and other accessories to a so-called apron dress.