A microscopic portrait of Britain's Queen Elizabeth has been created.
The image - which measures 46 by 32 microns - would fit onto a standard-sized postage stamp 300,000 times and was created by scientists at the University of Nottingham to mark the monarch's 60th year on the throne.
It has been engraved on a second-hand diamond, but is completely invisible to the naked eye.
Dr Michael Fay, one of those to create the image, said the picture was "very accurate".
He said: "We basically blasted bits of the diamond out by firing heavy bits of atoms at the carbon of the diamond.
"We can do this very accurately and produce a very small image."
Fellow scientist Professor Martyn Poliakoff added: "It looks very like the queen and from a scientific point of view, it looks very like the image that we used to make it.
"You can put one on top of the other and they match perfectly."
In addition to celebrate Elizabeth's reign as the British queen, the experiment was also carried out to promote chemistry at the university.