The Daily Diadem: The Countess of Paris's Mellerio Sapphire Tiara

Princess Hélène of Orléans wears the Mellerio Sapphire Tiara that belonged to her mother, the Countess of Paris, at her wedding to Count Evrard of Limburg-Stirum in 1957; the tiara, made in the 1930s in the Art Deco style, now belongs to Hélène's sister, Isabelle

Modern Maxima at the Ballet

Patrick van Katwijk/Getty Images

King Willem-Alexander and Queen Maxima attended a performance at the National Opera and Ballet in Amsterdam on Friday, part of a special commemoration of the work of the choreographer Hans van Manen.

The Daily Diadem: Queen Mary's Sapphire Bandeau

Princess Margaret of the United Kingdom wears Queen Mary's Sapphire Bandeau (often called the Marie Feodorovna Sapphire Bandeau) during the 1958 state visit from Germany; more on this intriguing tiara over here!

Prinsjesdag Jewels 2017

ROBIN VAN LONKHUIJSEN/AFP/Getty Images

Following the destruction in the Caribbean after the recent hurricanes, this year's Prinsjesdag in the Netherlands was a bit more sedate, with muted colors all around. But we did get some glittering jewels to enjoy!

Royal Wedding Jewels in Amorbach

Photo kindly provided by Svenja; do not reproduce.

This weekend, two descendants of the former royal families of Germany were married in Amorbach, and a major royal tiara was included in the celebrations.