Answer:
I cannot be bought cannot be sold even if Iām sometimes made of gold.
I do not contain flesh feather or scales; yet I have fingers and thumbs.
You have to travel far before you turn it over. What is it?
I am a portal to another world which you cannot enter. Only you can see me but I can't see you.
Only one color, but not one size, stuck at the bottom, yet easily flies. Present in sun, but not in rain, doing no harm, and feeling no pain. What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.