"The Jewelled Dagger."
By E(dward) A. Morphy (1867-?).
First appearance: The Royal Magazine (1914).
Short short story (6 pages, 3 illos).
Online at Hathi Trust (HERE).
- FictionMags characterizes our author as follows: "Writer, editor of the San Francisco Argonaut. Born in Killarney, Ireland."
The bottom line: "Is this a dagger which I see before me?"