Watch On the Adamant for Free: How to Stream the Movie Online at 123Movies. . The Adamant is a unique day-care centre. A floating structure located on the Seine in the heart of Paris, it welcomes adults suffering from mental disorders, offering the kind of care that grounds them in time and space and helps them to recover or keep up their spirits. The team running it tries to resist the deterioration and dehumanisation of psychiatry as best as they can.