The mysterious case of Kate's disappearing ring: Why we saw the Duchess's sapphire sparkler... then it was gone

It is probably the most famous engagement ring in the world. So it didn't take long for a few people to notice that the Duchess of Cambridge's ever-present sapphire and diamond sparkler had mysteriously vanished yesterday.

Catherine, who was with her husband, Prince William, for the opening of a new cancer centre, was wearing the £250,000 Garrard ring, once owned by Princess Diana, when she arrived at the Royal Marsden in south London.

It was a distinctive shock of colour against her oatmeal-coloured Amanda Wakeley dress.

Of course, there was a simple explanation for the missing ring. Rather than misplacing it, or making some ill-timed statement about the state of her marriage, the Duchess had simply stowed it in her LK Bennett clutch bag for hygiene reasons on the advice of hospital staff.

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