I just bought the Samsung S3 in China and Google Play is not installed - how can I get it, or at least get my Gmail?
I don't know it works or not. I just Googled and found this link.
According to the link you might want to use VPN services which changes your IP to other country IP which is valid in Google Play and also according to comment on same link one has changed his OS to Hongkong OS(i.e Google Play available OS).
You might want to go through LINK once. Hope this might be helpful for you!