Doesn't this make you dream of summer days at the beach? Jewel Box designed with the Creative Grids Half-Square 4-in-1 Triangle ruler (CGRBH1) but you can use your favorite technique for sewing perfect half-square triangles. At 63” square, it is a generous throw or a great tablecloth! 63in x 63in. Creative Grids CGRBH1 is recommended. Project Time: 6+ Hours. Fabric Type: Yardage Friendly. Project Type: Quilt.