Could that be Queen Victoria’s star? She was a tiny woman.
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The Duchess of Cornwall has not worn a Tiara but is wearing her Modern Diamond Earrings , the Royal Family Order of Queen Elizabeth II, and a Diamond Star of the Order of the Garter at tonight's Dinner for the Commonwealth Heads of Government in Rwanda !
The Diamond Star appears to be smaller than the Diamond Stars worn by the Queen or Queen Mother, but does look like an antique piece.