A simple riddle of mine, focused towards meter and rhyme.
I'm but a speck of fairy dust
A glitt'ring jew'l, but only just
So small I scarcely can be seen
A trinity in me convenes
And yet without me you can't see
Fine art and words are made of me
I'm resolute; through me you can
View realms beyond the mortal ken
I shrink along with passing years
My number grows, I gain more peers
But treat me well 'tis very true
I sleep and live and die like you
Please include explanations for as many lines as possible in your answer.