There is a SCAM BTG Webwallet being promoted on BitcoinTalk: www.[SCAM]bcdwallet[SCAM].org - URL has been broken on purpose to protect the newbies.
This scam is an obvious clone of the infamous "mybtgwallet" scam... asking you to put in your seed to claim BTCD. So, please remember the following:
NEVER PUT YOUR SEED INTO A WEBSITE!
NEVER PUT YOUR PRIVATE KEYS INTO A WEBSITE!
At the current moment in time... there IS NO Bitcoin Diamond network, no mining, no wallets... NOTHING... you cannot claim Bitcoin Diamond...
I guess you wanted to talk about BTCD (Bitcoin Diamond) not about BTG (Bitcoin Gold), as for BTG there is a valid wallet in place.