I sewed two sets of diamonds together and then sew those sets together for half the star.
The diamond seams are pressed in opposites direction so the seams nest together when you sew them together.
For those of you who have a star and don't know what size to cut the square that goes into the finishing the star. You can see a perfect square on the right and left. Measured down and accross for the square add the 1/4 inch seams and you have your square. The large triangles are half of the same square. Stay tuned. Once I do it, I will post exactly.