Size 30. Steel hook US 12.

Advanced.
First two rounds of motif = 1.25” diameter.

25 motifs join-as-you-go with no border. A kind of diamond/rhombus shape. Only partially written.

Pattern 1, pg 2 in Decorative Crochet.
Rombo fantasia in Puntorama Ganchillo.
Called Bleu Ciel in 1000 Mailles.