... small as +/-0.3mm, it can mark on a on gold and other precious stone with high accuracy. -Auto Industry: ... , belt buckle, gold and silver ornaments, signs, badges, time cards, business cards, greeting cards, calendars, photographs ,leather purses, belts, pens and pencil ... magnesium, zinc and all other metals), rare metals and alloys (gold, silver, titanium), metal oxide ( any kinds of metal oxide ...