Beginners should draw the design or figure first upon a piece of paper, or model it in clay or wax, and then draw the pattern upon the shell.

If the surface of the shell is irregular, do not attempt to make it level, but follow the irregularities, remembering that the white stratum is of the same thickness all through the piece, and that if the surface is filed down the ground will show through, disfiguring the appearance of the design, and preventing the pattern being modelled in proper proportions. When the design is settled upon, copy it on the shell with the help, if necessary, of a star, as in the head (Fig.2). Draw the outline slightly larger than the design, so as to allow of the proper proportions being secured on cutting. Skilful Cameo engravers never use a pencil, but sketch the desired outline with one or other of the cutting-tools; and many of them could not draw the figure on a piece of paper which they readily cut with their tools.