I start unseen in depths so far, yet end up shining like a star. Cut with care, I catch the light, what am I so hard and bright?

Whilst the answer to this riddle is like the ground inside your door, it may still knock you down or bring a sense of awe.

In a garden of colors, I stand tall and proud, dressed in royal hues. Often mistaken as a berry, I'm the nightshade's purple muse.

Sixty minutes plus flipboard writer give this

I have chains but no locks, a seat but no legs. I can take you high into the sky, yet I never leave the ground. A push or a pump will make me go.