Vintage pendant made in 1950

This lovely pendant is in fine condition and sparingly used. Now it wants to come out and see the light of day again, maybe with you? Made by Wilhelm Harbeck in Stockholm in 1950. 18k red gold with a blue stone, probably a synthetic aquamarine that was very popular in the mid-20th century. Dimensions including loop: 44 x 28 mm Dimensions of the stone: 11 x 11 mm Weight: 5.6 g