Remember that your choices are YOUR choices...you have a right and eye of your own to please with colors. However, when you open the question as to what do others think, be prepared for some criticism. I like to think of it as creative criticism, not negative, but sometimes we can come across rather negative in print rather than in voice.
I love your ideas...however, I would choose a bit less of a kelly green for the darker green diamond and go a bit more toward the olive that appears to be marbled on the white piece. They are totally different color values. Just a thought offered with a smile. It will turn out lovely whatever way you go!