Beazley Archive – Extensive site on classical gems Carvers and Collectors, a 2009 exhibition at the Getty Villa, with many features Digital Library Numis (DLN) Online books and articles on engraved gems The Johnston collection of engraved gems at the Metropolitan Museum of Art Damen, Giada. "Antique Engraved Gems and Renaissance Collectors", In Heilbrunn Timeline of Art History, New York: The Metropolitan Museum of Art, 2000–. online (March 2013) Gems Collection: Cornell Collection of Antiquities, at Cornell University Library and Cornell: Gem Impressions Collection.