British jeweller Graff has unveiled what it describes as the "most valuable watch ever created" - a timepiece replete with more than 110 carats of diamonds costing $US55 million ($A59.54 million).
Unveiled on Thursday at the watch industry's biggest annual tradeshow, BaselWorld, the glittering wristwatch, called Hallucination, is set with a multitude of rare coloured diamonds.
Gemologists, designers and craftsmen had spent thousands of hours to get the watch right, said the jeweller.
"The Graff Hallucination is a sculptural masterpiece; a celebration of the miracle of coloured diamonds," said company chairman Laurence Graff in a statement.
"For many years I have thought about creating a truly remarkable watch that illustrates our all consuming passion for diamonds.
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"The Hallucination has made my diamond dream a reality."
