From the pattern:
This star doily made of size 20 ecru thread, using a size 11 hook measures 13 inches diameter

This doily features:
triple crochet clusters
double crochet clusters
chain in chain
filled chains
picots

Ms. Hiddleson cautions: Please - watch your work, make nice compact tr, and this doily will not cup -- many crocheters are inclined to make tight ch, then loose stretched up tr or dc crochet, this usually always causes cupping - which is easily avoided if tr or dc part is made compact as it is supposed to be done.