Bitcoin Diamond (BCD) is a fork of Bitcoin that occurs at the predetermined height of block 495866 and therewith a new chain will be generated as the BCD. Bitcoin Diamond miners will begin creating blocks with a new proof-of-work algorithm, and will consecutively develop and enhance the protection for account transfer and privacy based on original features of BTC. This will cause a bifurcation of the Bitcoin blockchain.

There are many exchanges and wallets which support Bitcoin Diamond. You find the list here - List of Exchanges & Wallets Supporting Bitcoin Diamond (BCD)