Marie Queen of Romania - Her Cartier tiara (originally made in 1908 for her aunt Grand Duchess Vladimir) had a central sapphire of 137 carats.The Cartier long diamond sautoir has a sapphire of 438 carats.
"Yes, Regina Maria! The Queen of Romania. All heads are raised when her name is mentioned, so many legends and tales and stories have been made around her name, and many wonder which of them are true." - The Real Regina Maria