Black Star Sapphire - Week 4

It has a scientific name, but I never cared for it.
It's supposed to be shown in the sunlight just right, but I'd rather have night.
I've seen the exact thing on other women in my family,
But could never see it on me.
I didn't think I deserved it.
I was always scared my mother would give it to someone better than me.
But he insisted, so she did as well. She made sure his wish was granted, his present given.
At first it was a boulder weighing my down, it was an unfamiliar change in my appearance.
It fit just right, but god forbid if I ever took it off...
But it's always stayed put, it's become apart of me.
It's love in one of the most beautiful materialistic forms.
It changed me, made that little girl grow, become a woman.
It's an attention grabber, a conversation starter.
Bringing out the lust in all who see -
This ring shines like the morning sunshine,
With the beauty and mystery of the night sky.