Bitcoin Diamond (BTCD) is currently not available on the Ledger wallets, nor is it on Ledger Roadmap. However, the Bitcoin Diamond community is free to develop the BTCD integration app for Ledger. Development resources are readily available on our GitHub repository.
Users that were holding Bitcoin and using a Ledger wallet to manage their private keys before the Bitcoin Diamond fork may want to claim their Bitcoin Diamond using other wallets or services.
As this operation may require importing the seed that was securely generated by the Ledger hardware wallet into another wallet or service, users may be at risk. This is therefore not recommended. Users proceed at their own risk.