Updated list 2022-06-20
so the list of girls that will probably wear tiaras and other jewelry at the age of 18 is
Princess Iman of Jordan (born 1996)
Princess Salma of Jordan (born 2000)
Princess Alexia of The Netherlands (born 2005)
Leonor, Princess of Asturias (born 2005) already next in line to the throne
Princess Ariana of the Netherlands (born 2007)
Infanta Sofia of Spain (born 2007)
Princess Isabella of Denmark (born 2007)
Princess Eléonore of Belgium (born 2008)
Princess Josephine of Denmark (born 2011)
Princess Athena of Denmark (born 2012)
Princess Estelle, Duchess of Östergötland (born 2012)
Princess Leonore of Sweden, Duchess of Gotland (born 2014)
Princess Gabriella of Monaco (born 2014)
Princess Charlotte of Cambridge (born 2015)
Princess Adrienne, Duchess of Blekinge (born 2018)
Maybe tiaras at thier wedding and maybe other royal weddings and birthdays galas
Victoria Federica, Spain (born 2000)
Arrietta, Greace (born 2002)
Countess Eloise, Netherlands (born 2002)
Lady Louise Windsor (born 2003)
Princess Laetitia Maria of Belgium (born 2003)
Ana María, Greace (born 2003)
Maud Angelica, Norway (born 2003)
Princess Louise of Belgium (born 2004)
Leah Isadora, Norway (born 2005)
Irene, Sapin (born 2005)
Amelia, Greace (born 2005)
Countess Luana, Netherlands (born 2005)
Countess Zaria, Netherlands (born 2006)
Countess Leonore, Netherlands (born 2006)
Emma Tallula, Norway (born 2008)
Princes that later on get married and their wife will wear tiaras
Prince christian of Denmark (his wife will be future queen of Denmark)
Prince Vincent of Denmark
Prince Sverre Magnus of Norway
Prince Emanuel of Belgium
Prince Gabriel of Belgium
James, Viscount Severn
Prince Hashem of Jordan
Prince Nikolai of Denmark
Prince Felix of Denmark
Prince Hisahito of Akishino (Japan) (his wife will be future Empress of Japan)
Count Claus-Casimir, Netherlands
Prince Henrik of Denmark
Prince Nicolas of Belgium
Prince Aymeric of Belgium
Prince George of Cambridge (his wife will be future queen of Great britten etc..)
Prince Louie of Cambridge
Prince Jacques of Monaco (his wife will be future Princess of Monaco)
Prince Nicolas of Sweden
Prince Oscar of Sweden
Prince Alexander of Sweden
Prince Gabriel of Sweden
Crown Prince Moulay Hassan of Morocco (his wife will be future queen of Morocco)
Prince Charles of Luxembourg
Princes that are older and will get married a bit sonner then the kids
Prince Sebastian of Luxemburg
Prince Hussein of Jordan (his wife will be future queen of Jordan)
Future Queens with access to "Queen" jewllery
Crown Princess Victoria of Sweden (will be a regent queen)
Princess Elisabeth, Duchess of Brabant (will be a regent queen)
Catharina-Amalia, Princess of Orange (will be a regent queen)
Princess Ingrid-Alexandra of Norway (will be a regent queen)
Leonor, Princess of Asturias (will be a regent queen)
Princess Estelle, Duchess of Östergötland (will be a regent queen)
Camilla, Duchess of Cornwall married to Charles, Prince of Wales (queen?)
Crown Princess Mary married to Crown Prince Frederik of Denmark
Crown Princess Mette-Marit married to Crown Prince Hakoon of Norway
Catherine, Duchess of Cambridge married to Prince William, Duke of Cambridge
Stéphanie, Hereditary Grand Duchess of Luxembourg married to Guillaume, Hereditary Grand Duke of Luxembourg[/QUOTE]
Here is those whom has worn tiaras for the first time
Princess Aiko (Japan) at 20 years of age (born 2001) Mikimoto Diamond Tiara from her aunt, the former Princess Sayako
Princess Elisabeth, Duchess of Brabant (born 2001) she turned 18 in oktober 25th, 2019 already next in line to the throne
Elisabeth wore a new tiara a birthday gift from her parents on the celebration of Princess Ingrid Alexandra 18th birthday Diamond Tiara Furchsia Queen Elisabeth of Belgium
Catharina-Amalia, Princess of Orange (born 2003) she will be 18 on december 7th 2021 already next in line for the throne
Catharina-Amalia wore a family tiara the Dutch Star Tiara. on the celebration of Princess Ingrid Alexandra 18th birthday
Princess Ingrid-Alexandra of Norway (born 2004) wore her aunts tiara as she got as a gift when she turned 18, forst time worn at her celebration dinner on june 17th 2022
the Boucheron Pearl Circle Tiara.