A Belle Epoque colour-change sapphire and diamond brooch, circa 1900.
A Belle Epoque colour-change sapphire and diamond brooch, circa 1900.
A Belle Epoque colour-change sapphire and diamond brooch, circa 1900.
A Belle Epoque colour-change sapphire and diamond brooch, circa 1900.
A Belle Epoque colour-change sapphire and diamond brooch, circa 1900.