King Frederik and Queen Mary of Denmark welcomed Icelandic President Halla Tómasdóttir and her husband, Björn Skúlason, on Tuesday to begin the first incoming State Visit of their reign. For the State Dinner on Tuesday evening, Queen Mary turned to a 200 year old tiara. 

Queen Mary wore the Pearl Poire Tiara, a tiara that belongs to the Danish Royal Property Trust. The pieces in the trust are historically only worn by the Queen of Denmark. 

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This statement tiara has nineteen diamond arches; each arch has a suspended, hanging poiré (drop) pearl. 

Princess Louise of Prussia received the Pearl Poire Tiara as a gift for her 1825 wedding to Prince Frederick of the Netherlands. 

Her daughter, also named Princess Louise, married Crown Prince Charles of Sweden. After becoming King Charles and Queen Louise of Sweden and Norway, she inherited the Pearl Poire Tiara upon her mother’s death. 

Louise and Charles’ daughter, Princes Lovisa, married Crown Prince Frederik of Denmark and inherited the tiara when her mother died suddenly in 1871. 

Lovisa placed the tiara (and several other jewels) into the trust to guarantee that it could not be divided. While the tiara is not formally part of the crown jewels, it has only been worn by Queens of Denmark.