His father is a gemstone and precious stone enthusiast and when Lapis was born, his hair colours reminded his father of that gem xP (I still haven't decided how to handle it visually, but his hair is meant to have yellow flecks to further represent this rock pattern.)
Oh my God he's really really cute, ahaha xD That's an absolutely adorable little gesture, and the Cutie Mark came out really nice. Love the fetlocks and the wings and the everything too <3 This is all kinds of lovely and you are all kinds of lovely and aaaaa~
He uses his wings to conduct and to play instruments. They have a light enchantment on them, one for each instrument he aims to learn and connect with, so that he's able to use them in that way xP They are very important to his music life.