Likely made of 18K gold, the oval faceted aquamarine measures 17.9x8.5x5.7 mm, with step-cut diamonds weighing approx. 0.36 ct in total, the brooch measures approx. 39x25 mm, weight approx. 5.7 grams
The hook for the brooch pin is missing. The gold is slightly miscoloured. Indistinct hallmarks. Several stones with chips visible under 10x magnification.
Giron & Löngren executed Prince Oscar's (II) crown, Stockholm 1844 (Swedish silverwork Gold and silver marks 1520-1850, mark 2095, page 210), today Princess Estelle's crown