Answer:
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
Give it food and it will live, give it water and it will die.
I am seen in the water. If seen in the sky, I am in the rainbow, a jay's feather, and lapis lazuli.
Kills the bad ones and the sad ones. Tightens to fit, so one size fits.
Some live in me, some live on. And some shave me to stride upon. I rarely leave my native land. Until my death I always stand. High and low I may be found. Both above and below ground.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?