The gathering was initiated by Mark Weitzman, chief operating officer of the World Jewish Restitution Organization alongside Lord Pickles.
One topic under discussion at the meeting was the Washington Principles: a 1998 agreement on how Nazi-confiscated art could be restored to its former owners or their descendants.
Small auction houses across the world are reportedly still ignoring the principles and prioritising profit over moral principle, Lord Pickles claimed.
Even when states do provide a process by which victims of the Holocaust and their heirs can reclaim precious lost items, it can be emotionally fraught.
Lord Pickles added: "The whole process strips survivors of their dignity."
Yossi Avni-Levy, who previously served as Israel's ambassador to Serbia and Lithuania, said that to see stolen or abandoned communal Jewish property in Europe was a "chilling feeling".
Britain's Foreign Secretary James Cleverly - who briefly attended the conference - gave a "very strong message" on restitution, he added.
