This pattern works with just about any size thread or yarn and crochet hook, but for the little tiny hearts I love to make, I use a size 50 crochet thread and a US size 10 crochet hook. I also borrowed a pair of magnifying glasses from my mom; my eyes get tired when I make many hearts in a row. I timed myself one day while crocheting in the car (George was driving), and it took me 6 minutes to make one heart. Just FYI.
To begin, chain 2.
3 single crochet (sc) in first chain. Chain 1 and turn.
1 sc in first stitch, 2 sc in next stitch, 1 sc in last stitch. Chain 1 and turn.
*1 sc in first stitch, 2 sc in next stitch, 1 sc in remaining stitches. Chain 1 and turn.*
Repeat pattern from *to* until you have 7 stitches.
Last row: 1 hdc in first stitch. 1 dc, 1 trc, 1 dc in second stitch. 1 hdc in third stitch. 1 slip stitch in fourth stitch. 1 hdc in fifth stitch. 1 dc, 1 trc, 1 dc in sixth stitch. 1 hdc in seventh stitch. Chain 1.
Slip stitch six stitches down the side of the heart, chain 1 at the bottom, and slip stitch six stitches up the other side of the heart. Weave in ends.
Now you have a heart.