The group says an estimated $1 million (£650,000) could be generated through 50,000 couples choosing 100,000 Fairtrade gold wedding rings. That money could then be used to improve education, healthcare and livelihoods for some of the poorest mining communities across the world.

Amy Ross, project manager for Fairtrade gold, said: ‘The Church’s role is as significant today as it ever was as we continue to fight to bring the benefits to those who need it the most. In the early days of Fairtrade, Christian organisations, in partnership with development agencies, helped Fairtrade’s journey from marginal to mainstream. It is now time to do the same for Fairtrade gold.’

The campaign launch was marked with a human ring of gold formed on the steps of St Paul’s Cathedral.