When your lender trots out a great new credit card offer, you don't have to miss out. However, maintaining multiple accounts with the same bank carries a few risks that might outweigh the rewards.
Most credit card issuers actually want you to maintain more than one account with them. Increasing your credit means increasing your loyalty, which is why so many banks offer such targeted rewards credit cards. Here's some information about the Citi Diamond Preferred Card (this card is not currently available on cardratings):
Citi® Diamond Preferred® Card. Citi's own version of the "black card" boasts its own 24/7 concierge service to help book your hotel rooms, flights and more. You have free access to FICO® Scores. There is $0 liability on unauthorized purchases and Citi® Identity Theft Solutions.
Your current credit score and risk profile may already qualify you for the Citi Diamond Preferred Card. If you are uncertain about your ability to qualify, you may benefit from being an existing customer, as Citi's algorithm may even be more forgiving of a lower credit score if they can access internal information about your income or payment history.
However, many consumers find that opening a second credit card with the same issuer often results in a lower credit limit than they expected. Each bank sets its own risk threshold, so your maximum credit line could end up diluted across multiple accounts. After you open your new credit card, talk to your lender's customer service team to see if you qualify for a re-balancing of your overall credit limit across both accounts.