To create the frame bundle, measure the length of the tape and add 4½" to determine the length of the wires needed for the frame. You will need as many wires as are necessary to cover the girdle of the stone, plus one. (This cab is 3mm thick, and required a total of four, 22g square wires.) Use quilter's tape near the ends to secure the bundle. To add stability to the bundle while forming it, I used 20g half-round, half-hard wire and put one set of 3 wraps on each side of the center, 1/8" away.
Pro Tip: Due to the fragility of malachite, hardness of 4, mix square wire tempers, using half hard for the back edge, (which will also become the bail wire), and soft for the front and center of the frame. Measure and mark the centers of both the tape and the wire bundle. Line up the centers and copy the marks from the tape to the wire bundle.