To make this, you will need
the pattern that I have uploaded here
fabric for the shell, lining, and strap
stiff fusible interfacing
a small bit of tape
If you buy your fabric by the yard, half a yard is more than enough for the entire purse. I, however, had some remnants sitting around, and ended up using two 26 by 16 inch chunks.
For the interfacing, you will need a bit less that half of what you need in the way of fabric. I bought a yard, and only ended up using about a third of that.
For the shell and the lining of the purse, the pieces have little tabs. The tabs are for 5/8 inch seam allowance. Cut the tabs off for the interfacing.
The strap piece (4) does not need any seam allowance.
Cut out the pieces so that the fabric grain goes in the same direction for each piece.
Cut right along the edge of the pattern pieces.
Unfold the piece and fold the edges in to meet in the center. Press again.
Refold the center fold so that the raw edges are inside. Press one last time.
Sew the strap the entire length along both edges.
Allow this to cool and then gently tug at the edges to make sure that the interfacing is secure. Because of the structure of this bag, the interfacing will not be stitched in place.
Stitch along the length of the tabs on the edge of the interfacing.
Repeat this with every remaining outer piece 2.
Stitch the pieces together like you did with the previous ones.
Stitch these as you did when you stitched 1 and 2 together.
Press all of the seams to define the facets.
press the tabs that you did not sew to the inside.
Press the tabs at the opening of the lining to the outside.
Stuff the lining into the outer shell, and orient it to the shell.
Place the zipper edges in the opening so that they are sandwiched between the shell and lining. The zipper should be oriented so the closing it will bring the zipper pull toward the purse strap.
If your zipper is too long, run a series of stitches around the point where you want it to stop with some heavy thread.
Trim the zipper to the right length, and point the end so that it will fit snugly into the tip of the gem.
Sew the zipper in place, stitching through the lining, zipper, and shell.