I recall an interview when Queen Margrethe was asked about historical jewels being adapted. It was around the time the then CP Mary adapted the tiara of the Ruby Parure. The Queen recalled that Queen Ingrid had adapted the same tiara after she received it as Crown Princess from Queen Alexandrine. Her viewpoint was that if a tiara is either too big or too small, or otherwise ill-fitting, it is unlikely to be worn and will sit in a box. I'm sure she approves of the innovative ways Queen Mary is adapting some of these jewels so that they will be worn without ruining their historical integrity.