All sadness is gone, and all joy is here

My object, precious, beautiful and rare,
It makes me feel safe, then all sadness is gone, and all joy is here,
Locket, always with me, ever I go, up, down, right, left, diagonal, across, on the ground, in the air,
It may not physically, but my locket always has a place in my heart,
See it all the time in my mind, silver like beams of light from a full moon,
With chains from a treasure chest, in my mind it is a piece of art.

My object smells of sweet memories, me and my friend from when we were five right up to now,
I remember leaving my old school last year when she gave this locket to me, all wrapped in love,
It feels so magical like nothing before, nothing imaginable, it makes you think WOW,

I hear it when I open it, hear it all the time, trying to tell me something, what could it be?
I don’t know? Head to toe, I truly don’t know, I hope I’ll understand some day?
But when I SNAP! It shut the sound goes away, I Jingle it into the box and look, I see,
Shining light shimmers at me, as I think, what is it telling me? I don’t know YET!

Pretty design, I see, is this it? It says in fancy writing… ‘Twinkle, Twinkle Little Star’,
What does it mean?