This square (which can be used as either an applique or a lace block) is pattern #29 in the book “75 Lace Crochet Motifs.” Instructions on page 65. Featured on page 23 of the showcase.

Finished width: 2 inches (51 mm).
Thread required: 6 yards (5.5 m).

All pattern samples in this book are made with size 10 thread and a size 7 (1.65 mm) crochet hook.