It can be synthesized by dissolving gold powder in an aqueous solution of iodine and potassium iodide.

[3] With Lewis bases, AuI reacts to give numerous complexes.

[4] Gold monoiodide can be obtained by reacting a tetrachloridoauric acid solution with furthermore potassium iodide.

It is also possible to produce it by reacting gold and iodine in a protective atmosphere at around 390 °C.

[5] Gold monoiodide is a yellow, crystalline powder that gradually decomposes upon contact with water, humidity or light.