These are the following wallets where you can claim you BCD (Bitcoin Diamond)
- BitGO https://www.bitgo.cc/
- Bitpie http://bitpie.com/
- COLDLAR http://pc.coldlar.com/home/home
- ATOKEN http://atoken.com/
- KCASH https://www.kcash.com/
- QoinPro https://www.qoinpro.com/

For the complete information, visit the official website: http://btcd.io

If you already made claiming successfully your Bitcoin Cash (BCH) before then this would be easier for you now.