Gardner C. Teall, The Pleasures of Collecting
“ An intaglio is the product of a reverse and much more difficult process than that by which the cameo is evolved. An impression from a well-cut intaglio leaves a very fine design in relief, and it is marvelous to behold the results obtained by the infinite pains of gem-engravers. In our own day the masters of the art can be counted on the fingers of one hand, so greatly has the demand for work of the sort diminished. ”
