Not sure, but I like this answer anyway:
An eggshell
...
I am usually roseate,
But not always.
Eggshells are usually pinkish in colour, (the typical chicken egg), but other birds lay different coloured eggs.
I am sometimes inconsiderate;
But you need me.
Without the eggshell, the bird/reptile inside would die
I protect my jewel
That sometimes moves
The yolk is the golden jewel, and occasionally when fertilised it moves as it becomes an embryo
Because without it; I cannot confess,
To my lover;
All the love I have prepared.
The eggshell allows the embryo to mature
After I confess;
I part,
And I love.
When it confesses it breaks apart releasing the egg or the yolk to the world.
not sure but I like that idea :)