My Necklace

Have you ever left somewhere?
When you know you should’ve stayed
Do you have something to remind you of that time?
I do.
It is really light,
And is like a puzzle but easy.
It is rose gold,
And the same color as my sports shirt.
It starts with t and ends with e,
It says ‘Little sis’
My sister has one saying ‘Big Sis’.
Can you guess what I am?
How do you feel when you leave,
Someone?
Like family?
If
Pa
Were still here
I would thank him for getting it;
My necklace