Bitcoin Diamond is a new cryptocurrency created from a Hard Fork of Bitcoin Blockchain. There will be a total supply of 210 Million Bitcoin Diamonds and existing Bitcoin holders will get 10 BTD for every 1 BTC hold.
Lack of privacy and slow speed are the main reasons for this fork and Bitcoin Diamond will solve these problems by encryption and increasing the block size to 8MB.
Many Exchanges and Wallets Support this fork. You can find the detailed list here - https://finasko.com/crypto/list-exchanges-wallets-supporting-bitcoin-diamond-btd/