This square (which can be used as either an applique or a lace block) is pattern #30 in the book “75 Lace Crochet Motifs.” Instructions on page 66. Featured on page 22 of the showcase.

Finished width: 2 inches (51 mm).
Thread required: 9 yards (8.2 m).

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