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Sunday's St. Patrick's Day parade was attended by Prince William and The Duchess of Cambridge, Kate Middleton herself, wearing a fitted emerald green coat dress. The ensemble was also accompanied by a hat she had worn in 2016, Gianvito Rossi suede pumps, and Kiki McDonough drop earrings.

Kate Middleton's Green Coat on St. Patrick's Day 2019

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One piece that remains essential to her collection is her dazzling engagement ring. The 12-carat sapphire and diamond ring is valued at $50,000 and offers a unique history behind it. Princess Diana had previously chosen the ring back in 1981 from Garrard, the official jeweler of the royal family. 

Kate Middleton's Green Coat on St. Patrick's Day 2019

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Sara Prentice, Garrard's creative director, said about the ring in a Vogue interview that "It was said to be a strong influence on Prince Charles when he came to Garrard to purchase a ring for Lady Diana. He actually ended up setting a sapphire cluster ring for her, which was later given by Prince William to the Duchess of Cambridge on their engagement." 

Information originally sourced from PopSugar.