For the larger heart, I used 4mm bicone crystals and 4mm fire-polished beads but you could also use all 4mm fire-polished beads or 4mm pearls or rounds. The smaller heart is my favorite but it uses 15/0 seed beads and 3mm fire-polished beads so it's a bit tricky to bead until you're familiar with the pattern.
The pattern was extremely difficult and time-consuming to write and illustrate. I'm hoping it's clear but please send feedback if you have suggestions for improvement.