The tiara described in headlines as a “$13 million” emerald heirloom is the Greville Emerald Kokoshnik, a Boucheron piece made in 1919 for British philanthropist Dame Margaret Greville. The dollar figure is a rounded rendering of private experts’ estimates—not a confirmed sale price or an official Royal Collection valuation. Its documented history runs from Greville’s bequest to Queen Elizabeth the Queen Mother to Princess Eugenie’s 2018 wedding and Queen Camilla’s reported wearing of it in November 2025.
What is the Greville Emerald Kokoshnik tiara?
It is a broad, halo-like tiara in the kokoshnik style, a form associated with Russian dress tradition. Boucheron made it in 1919 for Dame Margaret Greville. Accounts describing the Royal Family’s website as their source identify the piece as platinum set with emeralds among brilliant- and rose-cut pavé diamonds; the Royal Family page itself is not directly cited here.
The centerpiece is reported as a 93.7-carat cabochon emerald. Reports disagree about the total number of emeralds, so a precise count should be treated cautiously. The consistent description is a large central emerald and other emeralds set among diamonds.
Who has worn it, and how did it enter the royal collection?
From Margaret Greville to the Queen Mother
Greville bequeathed her jewels to Queen Elizabeth the Queen Mother in 1942. The tiara later passed to Queen Elizabeth II, who lent it to her granddaughter Princess Eugenie for her 2018 wedding to Jack Brooksbank.
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Eugenie’s wedding and Camilla’s later appearance
Eugenie wore the tiara at her wedding in October 2018. In an audio guide for a 2019 Windsor Castle exhibition, she recalled: “It was the most incredible thing to wear such a piece of history that my grandmother had lent me, [a] very proud moment,” as reported by AOL.
Queen Camilla wore it at the Diplomatic Corps reception at Windsor Castle in November 2025. Reporting identifies Eugenie’s wedding as its previous public royal appearance. That describes documented public appearances, not whether the tiara may have been worn privately.
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Is the tiara really worth $13 million?
There is no verified sale price or official appraisal in the cited reporting. The headline figure is an approximate dollar conversion of expert estimates made in pounds.
- Jewelry expert Maxwell Stone of Steven Stone estimated the tiara at £10 million, according to Marie Claire. Stone described it as “the most expensive of all the tiaras we’ve studied”; this is his estimate, not an official valuation.
- Gemologist Joanna Wyganowska was reported by Cosmopolitan to put its value at upward of £5 million and perhaps £10 million.
Those are separate opinions, not a confirmed price range produced by a sale or formal Royal Collection valuation. The reported 93.7-carat central emerald is one feature cited in the coverage of the estimates, but it does not establish a market value on its own.
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Why is it rarely seen?
Available reporting documents a small number of public royal appearances: Eugenie’s wedding in 2018 and Camilla’s appearance at the 2025 Diplomatic Corps reception. That record supports calling it rarely seen in public, but it cannot establish how often it has been worn privately or why it is selected only occasionally.
Some commentators interpreted Camilla’s choice as a gesture of support for Eugenie. No confirmed explanation of Camilla’s motive is established, so that reading remains speculation rather than fact.
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Sources
- Marie Claire, November 19, 2025 — reporting on the tiara’s design and estimates attributed to Maxwell Stone.
- AOL, Bailey Bujnosek, November 20, 2025 — reporting on the history, appearances, and Eugenie’s exhibition audio-guide comments.
- Cosmopolitan, Corinne Sullivan, November 19, 2025 — reporting on the estimate attributed to gemologist Joanna Wyganowska.
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