Quarrying was the island's major industry in the 19th Century
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There is a rare opportunity for some residents in Guernsey to visit Jethou on Saturday.
Under the terms of the little island's lease, only six visit days are allowed each year.
The visiting allowances are split between the National Trust and La Societe Guernesiaise.
It is said that Jethou was joined to Herm until the 8th Century, when a great storm washed away the strip of land between the two islands.
Local granite
Jethou is famous for the large number of puffins which can be seen around the island.
Visit organiser John Videlo said Jethou was an island with a varied and fascinating history.
He said: "It's had a very chequered history all the way through. In the middle of the 19th Century, when quarrying was the major industry in Herm, the desire for granite spread to Jethou.
"The steps to St Paul's Cathedral are said to be made with granite from Crevichon, the little island to the north of Jethou."