It's giving Josef Albers! I love this chic minimalist charm, possibly converted at some point from a cufflink. It is crafted in solid 18k yellow gold with light blue and royal blue enamel. Though there is a small crack in the enamel (common with vintage and antique pieces) it is hardly noticable worn and ready to enjoy for many years to come.

18k Enamel Square Charm - 3.3g - .53”