Green’s Dictionary of Slang

gullion n.2

[play on slum n.3 (4)/slumgullion n.]

(US Und.) jewellery, esp. stolen jewellery; thus gullion-joint, a jewellery store; gullion-poke, a jewellery salesman’s gem wallet.

Show quotations
[US]Goldin et al. DAUL 87/2: Gullion. 1. Jewelry, especially stolen jewelry. [...] Gulllon-joint. A jewelry store. Gullion-poke. A jewelry salesman’s gem wallet.