What actually makes a good coffee lover gift for your coworker?
Start by eliminating mismatches: another mug unless the mug itself is unusually well chosen. Then narrow the list around better beans, brewing accessories, accurate tools, storage and small upgrades that improve a routine they already enjoy. Because this is for your coworker, keep interests they openly talk about and gifts that stay comfortably within professional boundaries in mind and avoid anything too intimate, expensive or difficult to interpret in a workplace context. A small but precisely matched upgrade can be more memorable than a larger generic present.
The strongest gift ideas usually come from the person’s real habits: what they already use, what they talk about and what would make an existing interest better.