Signet L Ring in Black Black Signet Ring Signet rings women, Black rings, Signet ring Classic Noir Polished Black Signet Ring Black stone signet ring Black Stainless Steel Square Signet Ring In stock! Lucleon. Characterized by a classic, flat faced design, this contemporary signet ring features the initial L on its top surface for a personalized focal point. Finished entirely in black, the piece presents a bold, monochromatic aesthetic that merges traditional signet style with a modern, minimalist sensibility.