35-Carat Beau Sancy Diamond to be Sold at Sotheby’s

The Beau Sancy is expected to fetch $2 to $4 million.  
Photo credit: AFP - Getty Images

A celebrated 35-carat diamond that has passed through European royalty for hundreds of years will be sold at auction during Sotheby’s Magnificent Jewels and Noble Jewels on May 15 in Geneva—on the second day of a two-day sale.

The international auction house says the Beau Sancy is one of the most important historic diamonds ever to come to auction. Passed down through the Royal Families of France, England, Prussia and the House of Orange, the celebrated diamond has witness of 400 years of European history. Weighing 34.98 carats, the modified pear double rose cut diamond comes to the market with an estimate price of $2 to $4 million.

“The Beau Sancy is one of the most fascinating and romantic gems ever to appear at auction and it is an immense privilege for Sotheby’s to handle the sale,” said David Bennett, chairman of Sotheby’s Jewellery Department in Europe and the Middle East and co-chairman of Sotheby’s Switzerland

Acquired by Nicolas de Harlay, Lord of Sancy (1546-1629), in Constantinople in the mid to late 1500s, the Beau Sancy is most likely to have originated from the mines in southcentral India near the city of Golconda, the source of history’s best-known diamonds, including the Hope, the Koh-i-Noor and the Regent. In 1604, the Beau Sancy was purchased by Henri IV of France and gifted to his wife, Marie de Medici. It was mounted atop the crown she wore at her coronation in 1610, as shown in a portrait by Frans II Pourbus, the Younger, now in the Louvre

Following Henri IV’s assassination by Ravaillac, the queen was exiled in disgrace and escaped to the Netherlands. Heavily in debt, her possessions were sold and the Beau Sancy was acquired by Prince Frederick Hendrick of Orange-Nassau (1584-1647). It was the most important expenditure in the state’s budget in 1641. In the same year, in an attempt to reinforce the alliances of the United Provinces of Holland with the great European powers, the diamond was used to seal the arrangement of the wedding of Frederick Hendrick’s son, Willem, later Willem II of Orange Nassau (1631-1660), to Mary Stuart, daughter of Charles I of England and Henriette-Marie of France, and grand-daughter of Marie de Medici.

After the death of her husband, Mary Stuart went to England with her jewels in order to support her brother Charles II in his fight for the throne. In 1662, the Beau Sancy was pawned to settle her debts and it was only in 1677, at the wedding of Willem III of Orange-Nassau (1650-1702) to Mary II Stuart, daughter of the King of England James II, that the diamond reentered the Treasure of the House of Orange-Nassau. In 1689, the couple ascended the throne of England and thus the Beau Sancy now joined the collection of the Queen of England. However, as the monarchs were childless at their death, the diamond went back to the House of Orange-Nassau.

In 1702, following the settlement of a dispute between the heirs to the House of Orange, Friedrich I, who had just been crowned the first King of Prussia, gave up the jewels of his legacy to obtain the Beau Sancy. The king made it the principal ornament of the new royal crown of Prussia and associated it with the first order of Prussia, the Order of the Black Eagle.

The largest gemstone within the House of Prussia’s collection, the Beau Sancy passed down to each successive generation until today. Worn by the women of the family on important royal occasions, the diamond adorned the costume of each successive bride on the day of her princely wedding, much like it had in the past. When the last German Emperor and King of Prussia fled to exile in Holland, in November 1918, the crown jewels remained at the Kaiser’s palace in Berlin. At the end of World War II, the collection was transferred to a bricked-up crypt for safe keeping in Bückeburg, where it was later found by British troops and returned to the estate of the House of Prussia.

After the war, the diamond was subsequently passed down to the eldest son of the Kaiser, Kronprinz Wilhelm (1882-1951) and his son, Prince Louis Ferdinand (1907-1994). After the death of Prince Louis Ferdinand, the diamond was inherited as part of the estate by his grandson, Georg Friedrich (1976-), Prince of Prussia and current head of the Royal House of Prussia.

The Beau Sancy has been shown publicly only four times in the last 50 years: first in 1972, alongside the Grand Sancy in Helsinki, in 1985, in Hamburg at the Schmuck aus dem Hause Hohenzollern exhibition, in 2001, in Paris again alongside the Grand Sancy at the Musée National d’Histoire Naturelle, and finally in 2004, in Munich at the Schatzhäuser Deutschands exhibition.

The Beau Sancy will be showcased in an international tour before its auction in Geneva on May 15, at the following dates and locations:

Hong Kong March 30 - April 2
New York April 14-16
Rome April 19
Paris April 24-25
London April 27-30
Zurich May 2-3
Geneva May 11-15
 

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