For my Crochet coaster set, I’ve used 15 g of this mercerized Giza cotton turquoise, (50g= 125m/ 1.76oz= 136 yards) and a 3 mm hook.

The final dimensions:
-first crochet coaster: circumference of 9 cm/ 3.5 inches.
-the second crochet coaster: a circumference of 10.5 cm/ 4 inches.

The pattern uses US crochet terminology.