Men's craftd Black Onyx Square Signet Ring

CRAFTD London

Gold-tone color matches, Square dark stone shape and color match, Signet ring style matches, Overall form factor and proportions are very similar, Stone setting style is consistent with what's visible, Price tier is appropriate for a fashion accessory

Missoma Lucy Williams 18ct Gold Vermeil Signet Ring with Black Spinel

Missoma.com

Gold-tone metal matches, Square dark stone (black spinel) matches shape and color, Signet ring style matches, Flush stone setting aligns with source, Ribbed shoulders are consistent with subtle texture in source, Overall form factor and simplicity are a strong match

mejuri 14k Yellow Gold / Black Onyx

Mejuri US

Gold-tone metal matches, Square dark stone (black onyx) matches shape and color, Signet ring style matches, Flush stone setting aligns with source, Ribbed shoulders are consistent with subtle texture in source, Overall form factor and simplicity are a strong match