The trove was found by local metal detector enthusiasts Reg Mead and Richard Miles, who had been hunting for them for nearly 30 years.
"We hit something hard. We just put the shovel in here and moved it. We hear that grinding noise of metal rubbing against metal. Just flicked and out came five Iron Age coins. You just go numb. You say: isn't that lovely? And it's a very quiet feeling, isn't it? Wow," Mr Mead said on the discovery.
Each coin is thought to be worth up to £200, making the find potentially worth one million pounds.
They are believed to date from the year 50BC (Late Iron Age), when the armies of Julius Caesar were advancing north-westwards through France, driving the tribal communities towards the coast.
"So they are from the Celts, from the French who were being attacked by Rome and occupied by Rome at that time. It's certainly one of the biggest. Nothing like this has been found in over 50 years. None of the people working on it had ever done anything like this in their careers," said Jersey Museum conservator Neil Maher, overseeing the removal and conservation of the coins.
The find is said to be northern Europe's biggest hoard of Iron Age coins.
