The Romans treasured vessels made of rock crystal, and quite a number of small scent bottles belonging to the Early Imperial period are known. There is, however, no parallel for the use of rock crystal for a utensil such as this spoon.
Christie's, New York. 1999. Antiquities. December 9, 1999. lot 414, p. 107.
Lightfoot, Christopher S. and Dr. Seán Hemingway. 2000. "Recent Acquisitions, A Selection: 1999-2000." The Metropolitan Museum of Art Bulletin, 58(2): p. 14.
Metropolitan Museum of Art. 2000. "One Hundred Thirtieth Annual Report of the Trustees for the Fiscal Year July 1, 1999 through June 30, 2000." Annual Report of the Trustees of the Metropolitan Museum of Art, 130: p. 18.
Picón, Carlos A. 2007. Art of the Classical World in the Metropolitan Museum of Art: Greece, Cyprus, Etruria, Rome no. 462, pp. 394, 496, New York: The Metropolitan Museum of Art.