Another recent addition to the collection is this diamond and emerald tiara, along with the possible attribution to Cartier, though it's not a piece I've seen before..
A delicate diamond tiara with seven larger foliate motifs and smaller spacers; with what looks like a nine amethyst cabochon tiara behind it, sharing the same case. (The amethyst tiara looks like so many lollipops, or maybe light bulbs.)
Cartier Ivy Leaf Tiara, circa 1914, of blackened steel and diamonds
A diamond and emerald belle epoque tiara, 1910. Designed with the diamond pinnacles of a fringe tiara alternating with foliate pinnacles topped with pear-shaped emeralds, all rising from a laurel leaf band. This piece fetched EUR30,000 at auction
Tsarina Alexandra of Russia Emeralds and Diamonds
Cartier Scroll Tiara, c.1910 Platinum, one cushion-shaped diamond, round old-cut diamonds Millegrain setting. Exhibition El Arte de Cartier Madrid
Antique Tiara, Belgium (ca. 1870, emeralds, diamonds). Once owned by a Belgian princess.
CARTIER. Tiara - white gold, one 140.21-carat cushion-shaped cabochon-cut emerald from Colombia, seven E/F IF/VVS1/VVS2 brilliant-cut diamonds totalling 4.58 carats, brilliant-cut diamonds. The creation can be worn as a tiara or a necklace.
Empress of Russia, Maria Feodorovna's emerald and diamond kokoshnik tiara. Originally belonged to Tsarina Maria Alexandrovna.