This is not my first jewel at all, so I guess it is alright!
The colour count could be a bit lowered i think; nice experiment anyway ^^
dig it. the jewel looks very convincing with the light placement.
I'd use a grey background instead of black. The dark green edges get lost in the black
Color count has never been my main concern, except for challenges. I am no pixel artist, I just like to experiment from time to time. Thanks for the comment ^-^