Pattern # 5 in Magic Crochet.

Pattern requires 40 g size 10 crochet cotton, 1.50mm hook,
24 5/8” plastic rings
80 seed pearls 3mm in diameter (8/0 beads)

Alternative
US size 2 and No. 5 crochet thread creates mat 18 1/2” in diameter

Called “Centro Rojo con Perlas Nacaradas” in Ganchillo Artistico.