Unable to answer "What are the opening hours here?" – Joailler Mathis (Jewelry Store) – https://osm.org/node/1374791425 via StreetComplete 62.1:

Probable agrandissement du magasin Mango : il jouxte désormais directement le magasin Bijou Brigitte

Attached photo(s):
https://streetcomplete.app/p/324885.jpg