Actually, there is a mystery in the Danish royal family...
Bjarne says on page 127 in his book that there were 2 versions of this tiara: 1 with 6 ears-of-wheats (worn by Princess Helena here) and 1 with only 4 ears-of-wheats given to her daughter Princess Feodora.
If this is the case - or it was her mother's tiara that had 2 ears-of-wheats removed I do not know.
What happened to the 1 or 2 tiaras? I do not know - except it/they was/were probably sold.
But:
There is a photo of Thyra Moes - granddaughter of Princess Helena wearing 1 ears-of-wheat as a brooch (I think it was in 1 of Stig's photos?).
There were also ears-of-wheats belonging to King Christian X who used 1 or 2 to have a tiara created for his wife
And Prince Knud (son of King Christian X) had 1 who used it to have a tiara created for his daughter in law, Countess Anne-Dorte