Earlier the brooch was called the ‚Jardine Star Brooch‘ and is said to have been left to The Queen by someone called Lady Jardine in 1981, but these are wrong.
Kaiserliche Perlen und Saphir Cluster Verschluss | Zarengeschenk Großherzogin Maria Georgievna von Russland | Prinzessin Maria von Griechenland und Dänemark
The hidden stories of the imperial jewels, more about:
Schmuck und Juwelen der Deutsche Fürstenhäuser | Royal Jewels – Historical Jewerly and Treasure of Royals and Aristocracy | bijoux historiques| исторические драгоценности