Re: jamavar lining of the dupatta
red and eggplant go really well together, as do red and saffron yellow, or red and burnt orange. there are many different shades of green - if you're sick of emerald green, try a brighter chartreuse, maybe? or a seafoam green which is sort of like a blue-green mix. you could also keep it red but do a patterned/textured trim ... like red on red jamavar. and as odd as it sounds, red and a dark pink, like a magenta, would also look really pretty together.
i'd keep away from the colored stones and insert small diamantes into the kaam instead. they sparkle and are super pretty and since your outfit is such a rich color with probably an equally rich accent color, adding a colored stone on top might be overkill.