Scales that are either high precision or sensitive to the slightest weight change are required for diamonds and precious metals. Portable gold and diamond scales, that dismantle to fit in small wood boxes, suitable for a coat pocket, were produced from the mid-1800s into the 20th Century. Made of brass or nickel brass, a simple balance is typical of these scales. The beam rests in a brass frame with a fixed pointer and a vertical bar for holding or hanging by cord. Alternatively the beam is positioned on a post that comes with the set. The post may screw into the top of the box. The pans are then hung by a thin cord to the ends of the beams by means of small hooks or agate boxes. Meant for travel, these scale boxes typically contained gram weights to weigh gold and carat weights to weigh diamonds. Larger desk top variety scales for diamonds and precious metals were also designed to dismantle and fit inside a mahogany or other hardwood box drawer. Precision laboratory scales, specialized for diamonds and gold, have small, sometimes tiny pans. Coin scales, in contrast, are commonly steelyard in design with grooves or notches along the beam to set the counterpoise for quick comparison of a coin with a standard. Early money scales had graduated beams made of ivory or wood that fit in a grooved flat wood box along with the counterpoise weight for easy transportation.