No it can't be. The turqoise tiara that were a wedding present to Louise and later Louise, can't be the star tiara, since countess Ruth said that one was a gift from Ingeborg's cousin tsar Nickolas. Queen Louise's turqois tiara must be somewhere else. Could it be the sapphire tiara that once belonged to princess Thyra? Apparently the sapphires could be exchanged with turqoises.