Precious metals and their alloys and goods in precious metals or coated therewith, not included in other classes, namely, rings, necklaces, colliers in the nature of chokers, earrings, brooches, pendants, watch cases, watch back casings, watch crowns, watch movements, watch dials, watch hands, watch straps and bands, watch buckles and watch boxes; jewellery, precious stones; horological and chronometric instruments