Koch

A FINE BELLE EPOQUE AQUAMARINE AND DIAMOND NECKLACE, BY KOCH

KOCH: A FINE EARLY 20TH CENTURY NATURAL PEARL AND DIAMOND TIARA

A PEARL AND DIAMOND NECKLACE, BY KOCH

A DIAMOND PENDANT/BROOCH, BY KOCH

AN EARLY 19TH CENTURY DIAMOND SET BROOCH, BY KOCH

AN ANTIQUE TURQUOISE AND DIAMOND PIN, BY KOCH

A late 19th century sapphire and diamond pin, by Koch and two diamond brooches