Bavarian Pearl Tiara in the Residenz Museum in Munich. Attributed to Caspar Rieländer, the famous Munich court jeweller, ca 1825, was made for Queen Therese of Bavaria, Pss of Saxe-Hildburghausen 1792-1854. 16 diamond arches with pearl drops hanging from lover's knot bows, topped with pear shaped pearls (photo by atsubor, via Flickr).
Tiara of the Bagraton. A memorable combination of pinkish spinels and diamonds this tiara once belonged to a Russian princess, Catherine Bagration. It was purchased by the current Duke of Westminster for his bride, and she wore it at their 1978 wedding.