I see so much joy in this heart, it makes me smile everything I see it.
The aqua-blue squared stone is apatite. Like all the stones, wood and other elements I use in these mala style necklaces, apatite has several meanings and/or uses in different cultures and eras. The one I have always liked best, because apatite always looks happy to me, is it's ability to enhance (some believe to give us a permission of sorts) to be creative and play.
Pairing apatite with a coral, the red faceted bead, can bring out the "playful" in us. Play or playfulness can mean so many things from binge watching something you enjoy to get lost in, cooking, jogging and making glass hearts. Playing is always perfect because you can't fail or win, you just enjoy.
I really hope as you put this very happy piece on you remember that you at your very core are a joyful being that loves play.