Sarah’s stunning ring was thought to have been crafted by the royal jeweller Garrard, and she continued to wear it for several years after she separated from Andrew in 1992.
Ruby engagement rings are rare in the Royal Family, although the Queen’s sister Princess Margaret also boasted a red sparkler from her ex-husband Antony Armstrong-Jones.
Charlotte added: “Princess Eugenie’s mother, the Duchess of York Sarah Ferguson, and her great-aunt Princess Margaret, also had untypical engagement rings, both opting for distinctive rubies.
“The Duchess of York’s ring, like her daughter’s, was a cluster ring with the ruby surrounded by diamonds.
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source: express.co.uk