![Queen Mathilde of the Belgians, with Princess Eleonore, attends a performance of Cassandra at the Royal Theatre of La Monnaie in Brussels on September 21, 2023 (ERIC LALMAND/BELGA MAG/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera01.jpg?resize=1200%2C798&ssl=1)
It was a gleaming gold night at the opera for Queen Mathilde of the Belgians and her younger daughter, Princess Eleonore, on Thursday.
![Queen Mathilde of the Belgians, with Princess Eleonore, attends a performance of Cassandra at the Royal Theatre of La Monnaie in Brussels on September 21, 2023 (ERIC LALMAND/BELGA MAG/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera02.jpg?resize=1200%2C800&ssl=1)
Mathilde and Eleonore were among the audience members at the Royal Theatre of La Monnaie in Brussels on Thursday evening attending a performance of Cassandra, a new opera with music composed by Bernard Foccroulle and a libretto by Matthew Jocelyn.
![Queen Mathilde of the Belgians, with Princess Eleonore, attends a performance of Cassandra at the Royal Theatre of La Monnaie in Brussels on September 21, 2023 (ERIC LALMAND/BELGA MAG/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera04.jpg?resize=1200%2C776&ssl=1)
Queen Mathilde and Princess Eleonore were greeted by composer Bernard Foccroulle during their visit to the theater.
![Queen Mathilde of the Belgians, with Princess Eleonore, attends a performance of Cassandra at the Royal Theatre of La Monnaie in Brussels on September 21, 2023 (ERIC LALMAND/BELGA MAG/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera05.jpg?resize=1200%2C864&ssl=1)
They were also welcomed by the theater’s general director, Peter De Caluwe.
![Queen Mathilde of the Belgians, with Princess Eleonore, attends a performance of Cassandra at the Royal Theatre of La Monnaie in Brussels on September 21, 2023 (ERIC LALMAND/BELGA MAG/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera03.jpg?resize=1200%2C1781&ssl=1)
Queen Mathilde chose an ensemble from Natan for the opera visit: a black and gold floral top with black trousers.
![Queen Mathilde of the Belgians attends a performance of Cassandra at the Royal Theatre of La Monnaie in Brussels on September 21, 2023 (ERIC LALMAND/BELGA MAG/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera07.jpg?resize=1200%2C1834&ssl=1)
She accessorized with a pair of earrings in her favorite style: oversized, golden statement pieces.
![Christine Bekaert](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera10.jpg?resize=1200%2C1200&ssl=1)
These are the large, gold-plated Poppy earrings from the jewelry designer Christine Bekaert.
![King Philippe and Queen Mathilde of the Belgians wave before a concert on the eve of Belgium's National Day at Bozar in Brussels on July 20, 2022 (HATIM KAGHAT/Belga/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2022/07/2022-0723-01-belgium06.jpg?resize=1200%2C897&ssl=1)
Mathilde debuted the earrings in 2022. One of her most prominent previous appearances came during another theater event: the concert held on the eve of National Day in July 2022.
![Queen Mathilde of the Belgians, with Princess Eleonore, attends a performance of Cassandra at the Royal Theatre of La Monnaie in Brussels on September 21, 2023 (ERIC LALMAND/BELGA MAG/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera08.jpg?resize=1200%2C1751&ssl=1)
Mathilde also wore her usual bracelets and watch, as well as her wedding ring on her right hand and her diamond and blue gemstone ring on her left.
![Queen Mathilde of the Belgians, with Princess Eleonore, attends a performance of Cassandra at the Royal Theatre of La Monnaie in Brussels on September 21, 2023 (ERIC LALMAND/BELGA MAG/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera06.jpg?resize=1200%2C1303&ssl=1)
Princess Eleonore was elegant in a sparkly black top and black trousers for the opera performance.
![Princess Eleonore of Belgium attends a performance of Cassandra at the Royal Theatre of La Monnaie in Brussels on September 21, 2023 (ERIC LALMAND/BELGA MAG/AFP via Getty Images)](https://i0.wp.com/www.thecourtjeweller.com/wp-content/uploads/2023/09/2023-0924-01-opera09.jpg?resize=1200%2C1783&ssl=1)
Her visible jewelry was minimal—just a ring on her right hand.
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