Page 100 Bjarne Steen Jensen wrote in 1909 the tiara went to Prince Viggo. Princess Viggo change it and gave it after to Countess Ruth. This is not correct!
The Royal Watcher writes that the Princess gave the tiara to Prince Aage who married Mathilde Calvi de Corti. She wore the base as Choker and is seen wearing the tiara. Their only Son Valdemar inherited the tiara but no picture of his wife Flora wearing the tiara. They had no Children , lived in Paris and were close to Princess Chantal d'Orléans, baroness Sambusy de Sorgue. He gave her the Opal tiara AND its Choker necklace. The Princess wore it at the Prewedding of Duchess Mathilde in 1988. She is often seen with its base as necklace with pendents , and the Choker Necklace.
Prince Valdemar was her daughter Kildine Godfather, she wore the Choker at Prince Jean, now Comte de Paris Wedding. The two jewels of Princess Marie are again in France.