The crest is surrounded by a further “18 Edwardian-cut diamonds and 36 small round cut emeralds,” per the jewelry expert, along with a “15 carat detachable green cabochon emerald” that hangs from the bottom of the sparkler.

Middleton also chose another piece of jewelry that Princess Diana was known for during today’s visit, wearing her late mother-in-law’s Collingwood Pearl earrings.

Middleton debuted a new piece from Emilia Wickstead for today’s state visit.

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Princess Diana wore the brooch as a necklace during her time as Princess of Wales.

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Princess Diana wore the brooch as a necklace during her time as Princess of Wales – often wearing it without the detachable emerald drop.

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The Queen Consort was pictured wearing the Prince of Wales brooch in 2012.

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The princess brought out her fashion A-game to go with her brooch, wearing an Emilia Wickstead coat dress and a matching pillbox hat by Sean Barrett Millinery.

The vintage-style, berry-colored coat is a custom piece from the New Zealand-based designer, which has been one of MIddleton’s go-to labels for years. The princess added the same bow-trimmed hat she wore in blue for Commonwealth Day in March, with the milliner creating a berry version for today’s visit.

Princess Diana
Princess Diana wore the brooch as a necklace during her time as Princess of Wales.
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The mom of three added Gianvito Rossi burgundy suede pumps and a coordinating Mulberry clutch to accessorize her look — which marks the sixth head-to-toe monochrome outfit for the princess this month.

The sparkling moments won’t end with the Prince of Wales brooch today; this evening, members of the royal family will break out their tiaras and gowns for a state banquet in honor of President Ramaphosa.

Camilla Parker-Bowles
The Queen Consort was pictured wearing the Prince of Wales brooch in 2012.
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