Vintage Swedish silver and blue enamel triangular clip earrings 1950s

A vintage pair of solid silver and blue enamel clip earrings - each earring consisting of a rounded slight concave triangular motif with a central reserve of aqua blue enamel with a clip back fitting - marked for Atelier Borgila of Stockholm and hallmarked for 1958 - total weight of the pair 7.1grms - overall dimensions 19 x 18mm - 1958 Sweden