The story
Graham gems were most prominent during the 19th and early 20th centuries, particularly from the 1860s through the 1920s.
Etymology from Wiktionary, CC BY-SA 4.0.
graham gem
Today it means: A small, muffin-like quick bread made from coarsely ground whole-wheat graham flour, which were exceptionally popular in American households during the 19th and early 20th centuries. Full definition →