We've now seen (and promptly deleted) a few threads about selling or buying accounts, and certain third parties offering to sell Gems in Clash of Clans.
Selling accounts is prohibited in our Terms of Service. But even more importantly, the risk of fraud is too great for any of our players to be exposed to these potential scams. A newly bought Game Center account can very easily be reclaimed by the seller, and in such situation neither Supercell nor Apple can help the victim - there are no rules or laws to protect a customer on the black market. If you get scammed while breaking the rules, you're out of luck and your money.
It's safe to assume that people peddling Gems for Clash of Clans are also frauds. The only way to get gems in Clash of Clans is to buy them with in-app purchases, or doing certain tasks in-game. If you attempt to buy gems from disreputable sellers, they will ask for your Apple Account or Game Center login information. They will then link your account to a stolen credit card or use other illegal means to purchase Gems for your account. These criminals acquire new accounts to abuse through online auctions, or they may decide to use your account for this purpose after you give them your login credentials.
For the safety of our players, we have strictly prohibited any discussion about these topics on the forums. Any infringing messages or threads will be deleted without prior notice and the user will be banned from the wikia.Keep in mind that Supercell employees and Clash of Clans players will never ask for your password or personal login information. If someone asks, they are a scammer attempting to steal your account. There have been multiple reports of users impersonating top level players, such as Jorge Yao, in order to obtain login information from users. Please NEVER give your login and password away to ANYONE!
Play safe and smart!