Citi Diamond Preferred Card review

Citi publishes two long-intro balance transfer cards: the Diamond Preferred and the Simplicity. Both run 21-month 0% on balance transfers, both charge a balance transfer fee, both have no annual fee. The differences are small but worth knowing.

Simplicity carries a few additional borrower-friendly terms: no late fees and no penalty APR even if you miss a payment. Diamond Preferred is the more standard product on those fronts; late fees and penalty APR apply per standard Citi terms. Simplicity also tends to have a slightly shorter purchase intro period.

If your only goal is moving a balance and clearing it inside the intro window, Diamond Preferred and Simplicity are essentially equivalent on the transfer math. If you want the safety of no-late-fee and no-penalty-APR protection in case life happens, take Simplicity. If you are confident you will pay on time and want the slightly longer purchase intro window, take Diamond Preferred.

Most balance transfer cards require the transfer to complete within a window from account opening. On the Diamond Preferred, that window is four months. If your transfer settles inside four months of opening the card, the full 21-month 0% clock begins on the date of the first transfer. If you miss the window, your transferred balance accrues at the regular ongoing APR.

In practice, four months is generous. The mechanical steps (apply, get approved, receive the card, log in to online banking, submit the transfer request, wait for the old issuer to process and the new issuer to credit) can take three to four weeks. Submit the transfer in the first month after opening to be safe.

Calculate the break-even before transferring. Our balance transfer vs low APR calculator shows the point at which the 5% transfer fee is more than offset by the avoided interest. On most balances above $2,000 it pays off comfortably, provided you actually clear the balance inside the intro window.

The Diamond Preferred is a balance transfer card with a smaller purchase intro window grafted on. The purchase 0% lasts 12 months from account opening while the transfer 0% lasts 21 months from first transfer. If you make purchases on the card thinking you have the same 21 months, you will be surprised when the purchase intro ends nine months earlier than the transfer intro.

Practical advice: do not use this card for new purchases. Use it for the balance transfer, lock the card in a drawer, and clear the transferred balance by month 21. Make purchases on a card you already have or on a separate purchases-focused card. This avoids the awkward situation where interest starts accruing on new purchases while the transfer balance is still at 0%.

If you genuinely need a long 0% on purchases (funding a planned large expense), the Wells Fargo Reflect offers a 21-month intro on both purchases and qualifying transfers, a much cleaner fit for that use case.

On day one of month 22, any remaining balance on the card (whether from the transferred balance, purchases that survived past their 12-month intro, or new charges) accrues at the standard ongoing variable APR. Citi publishes that APR range at application; it sits in the higher end of major bank ranges, often quoted from the high teens up into the high 20s based on credit profile.

The post-intro APR is the reason this is a finite tool. Do not treat the Diamond Preferred as a long-term holding. If you have a residual balance after 21 months, you have not used the card correctly. The plan should be to pay it off in full and either close the card (if you do not value the credit line for utilisation) or hold it open with no balance.

Closing the card immediately drops it from your credit utilisation calculation, which can dent your credit score in the short term. Many people leave the card open and locked in a drawer to preserve the credit line without active use.