I shot this in my garden. I consulted Dragonflies and Damselflies of Kerala by Kiran C.G. and David V. Raju, and it appears to be a female ruddy marsh skimmer (Crocothemis servilia). I posted the photo to two nature groups, and the consensus is that yes, it's most likely a female ruddy marsh skimmer. But be warned — I haven't got definite confirmation yet. Interestingly, I'd photographed the male earlier (see Dragonfly and Flower). The male and female look very different — this is a striking example of sexual dimorphism.
Update on January 26, 2016: It's actually a female of Brachythemis contaminata (Fabricius,1793), Ditch Jewel. Thanks to C. G. Kiran, a co-author of the above-mentioned book, who has commented below and set the ID straight.
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