Glossy quality crochet cotton or fil d’Ecosse, size 10. Steel crochet hook US size 9.

First three rounds = 2 3/8” in diameter.

Intermediate. Double treble cluster, double triple crochet, work in chain/stitch, 4 chain picots.

Pattern 21, page 46 of Decorative Crochet. Called “Prune” in 1000 Mailles.