Î¤he Greek Royal Jewels
According to this article:
The Empress consort Victoria of Germany, daughter of Queen Victoria gave her daughter, Princess Sophia of Prussia a diamond tiara as a wedding present, upon her marriage with Constantine of Greece in 1889. The tiara was passed on to Queen Frederika. The tiara, which some thought had been sold by Queen Frederika in the seventies, was worn by Princess Marie-Chantal in 2012.