The Stone Ear

Published in Pearson's Magazine (UK - Sep. 1933). Reprinted in Ellery Queen's Mystery Magazine (US - Mar. 1948). Collected in the book The Duel of Shadows.
What killed Sir Roger as he picked up one of two identical antique glass goblets, both very expensive and dear to the retired judge, said goblet disappearing completely while the other remained intact. That is what the deceased's nephew, Barnabas Hildreth is curious to discover.