Pope Francis has gifted fragments believed to be from the True Cross on which Jesus was crucified to form part of a new processional cross to be used at the coronation of King Charles III.
It will lead the coronation procession at Westminster Abbey in London on May 6.
It features two small shards from the relic donated by the Pope which have been shaped into a cross behind a rose crystal gemstone.
"In a significant ecumenical gesture, the Cross of Wales will incorporate a relic of the True Cross, the personal gift of Pope Francis to His Majesty The King to mark the Coronation," the Church in Wales, a branch of the Anglican Church, said in a statement.
"Its design speaks to our Christian faith, our heritage, our resources and our commitment to sustainability," said Andrew John, the Anglican Archbishop of Wales, who blessed the cross at a service on Wednesday in Llandudno in North Wales.
"We are delighted too that its first use will be to guide their majesties into Westminster Abbey at the Coronation Service."
Charles has close links to Wales. As heir to the British throne, he held the ancient title of Prince of Wales until he became King in September last year on the death of his mother, Queen Elizabeth II, aged 96.
His son and heir William is now Prince of Wales.