Also note that you’ll need a trading account at the exchange you choose to use, and in most cases that means you’ll have to submit quite a bit of personal information to meet the KYC and AML regulations upheld by almost every centralized exchange. If you aren’t fond of the idea of potentially linking your personal details to your Bitcoin Diamond by purchasing them through an exchange you could use a peer-to-peer marketplace instead. LocalBitcoins is one such P2P marketplace, but you might find liquidity quite thin for buying.