Rnd 1, col A - Into a MR, ch2 (not counted as a st), 12dc into the ring, pull yarn tail tight to close ring, sl st into 1st dc to join, cut yarn, fasten off, and weave in ends. [12dc]
Rnd 2, col B - Slip knot yarn to hk, sl st yarn into any st. Ch1 (not counted as a st), 2sc in same sp as ch-1, * 2sc in next st, rpt from * 11 times, sl st into 1st sc to join, cut yarn, fasten off and weave in ends. [24sc]
Rnd 3, col C - Slip knot yarn to hk, sl st yarn into any st. Ch1 (not counted as st), 2hdc in same st as ch-2, 1hdc in next st, * 2hdc in next st, 1hdc in next, rpt from * 11 times, sl st into 1st dhc to join, cut yarn, fasten off and weave in ends. [36hdc]
Rnd 4, col D - white - Slip knot yarn to hk, sl st yarn into any st. Ch2 (not counted as a st), 1dc in the same sp as ch-2, 1dc in next 35-sts, sl st into 1st dc to join. [36dc]
Rnd 5 - Ch2 (not counted as a st), 2dc in same sp as ch2, 1dc in next 2-sts, *2dc in next st, 1dc in next 2-sts, rpt from * 11 times, sl st into 1st dc to join. [48dc]
Rnd 6, col E - Slip knot yarn to hk, sl st yarn into any st. Ch1 (not counted as a st), 1sc in same sp as ch-1, 1sc in next 2-sts, a SPsc into the base of next st, *1sc in next 3-sts, SPsc the into base of next st, rpt from * 11 times, sl st into 1st sc to join, cut yarn, fasten off weave in ends. [48sts]
Finish - Depending on your tension the coasters may curl up a little, this can easily be fixed, by steam-blocking them. Place the coasters wrong side up onto the ironing board, cover with a cloth, and gently press with a steam iron.