Source: Library of Congress newspaper collection.
From "The Daily Alaska Empire" (Juneau, AK; dated July 5, 1951):
I was searching for something else on that website when I came across this photo of then-Princess Elizabeth, Duchess of Edinburgh, who paid a visit to the Boys' Brigade at the Festival of Boyhood rally in London. She was wearing an ermine wrap over her white gown at that time but she also wore what's appeared to be a single diamond rivere necklace and this pair of earrings (it looks like a pearl in the center surrounded by maybe gold and small diamonds, perhaps). Is this the same pair of earrings now worn by her daughter, Princess Anne?