Marie-Étienne Nitot also played an active role with his son into re-assembling the Crown Treasury (Trésor de la Couronne) dismantled and spread apart during and after the French revolution, and were exclusive providers of precious stones to Napoleon.

[citation needed] Marie-Étienne Nitot actually designed Joséphine's entire Emerald Parure that belongs today to the Royal family of Norway.

The sapphires are thought to have been a wedding gift from Napoleon to his step-daughter Princess Augusta of Bavaria, Duchess of Leuchtenberg and then passed to the Swedish royal family with Queen Josephine.

The necklace, featuring 234 diamonds totaling approximately 263 carats, was gifted to Empress Marie-Louise and is now housed at the Smithsonian National Museum of Natural History in Washington, D.C.[6] Nitot also designed the Marie Louise Diadem in 1810 as part of a parure that included a necklace, earrings, a comb, and a belt buckle, all set with emeralds and diamonds in silver and gold.

While the necklace and earrings are now in the Louvre, the diadem, with its emeralds replaced by Persian turquoise in the 1950s, is housed at the Smithsonian National Museum of Natural History.