Rnd 6: 1 ch, [with Coral, 4 dc, 2 dc in next st, 1 dc, with Pink, 3 dc, 2 dc in next st] four times. With Coral, ss into the first st in the round. (48 sts)
Rnd 7: 1 ch, [with Coral, 7 dc, with Pink, 1 dc, 2 dc in next st, 2 dc, 2 dc in next st] four times. With Coral, ss into the first st in the round. (56 sts)
Rnd 8: 1 ch, [with Coral, 7 dc, with Pink, 1 dc, 2 dc in next st, 4 dc, 2 dc in next st] four times. With Coral, ss into the first st in the round. (64 sts)
Rnd 9: 1 ch, [with Coral, {2 dc in next st, 2 dc}, twice, 2 dc in next st, with Pink, dc2tog, 2 dc, with Coral, 2 dc in next st, with Pink, 2 dc, dc2tog] four times. With Coral, ss into the first st in the round. (72 sts)
The next round has increases and decreases to create the final heart shape. This round will come out a little wavy. Rounds 11 and 12 will even it out so the edges are circular and the coaster is flat.
On the final round I do my colour changes a little differently, as I find it looks nicer. I don’t change to Pink on the last yarn over of the previous stitch and I complete the dc3tog with Coral. If you find this too tricky, you can work as normal.