A method for assembling a stone on to a mounting, the stone being cut to have a crown, a girdle and a pavilion, the method including providing a substrate including an adhesive layer; positioning the stone on the adhesive layer; heating the adhesive layer; exerting a pressure on the stone; positioning a setting sheet around the stone above the adhesive layer, so as to form a peripheral free space between the setting sheet and the stone, at least at the level of the girdle and of areas of the crown and the pavilion adjacent to the girdle; depositing a metallic layer in the peripheral free space from the setting sheet, at least at the level of the girdle and of the areas of the crown and the pavilion adjacent to the girdle, the metallic layer and the setting sheet forming the mounting; releasing the stone and its mounting from the substrate.