The Swedish monarchy traces its roots back to the days of Napoleon who put the first of one of his generals on the throne of Sweden. Most people believe that the Cut Steel Tiara originally belonged to Queen Josephine, Napoleon's wife, who brought it to Sweden. 
The thing that is unique about it is that it has not a single precious precious stone in it; yet it glitters as though it were all diamonds.
Instead, it is all highly-polished cut steel set with gold in a design of oak leaves, acorns, flowers, and feathers.  For many years cut steel was a cheaper alternative for women who wished to be stylish but could not afford the real thing.

King Carl Gustav's three sisters, princesses of the Bernadotte dynasty, have all worn the Cut Steel Tiara on occasion.
That does not mean it is not valuable.  The workmanship alone is exquisite.  Nonetheless, it seems to have languished in relative obscurity in recent years until the present queen of Sweden, Queen Sylvia, came across it.  She had it revurbished and it has become a favorite of all the women in the royal family.  

Queen Sylvia wearing the cut steel tiara.

Crown Princess Victoria especially likes it and has also worn it for a number of state events.


You can go to this link--https://www.youtube.com/watch?v=m2Mquhyens4--to see Crown Princess Victoria in a brief clip wearing the steel cut tiara at the 2010 Nobel Awards Banquet. Notice how it glitters like diamonds as she turns her head from side to side.