Citi Diamond Preferred review

Best for

The Diamond Preferred is for cardholders staring at a five-figure balance who need maximum runway to clear it. Twenty-one months is enough time to amortize $12,000–$18,000 with disciplined fixed payments and no interest accrual. It's also a fit for someone who wants the longest intro window on transfers but doesn't need the same length on new purchases — a buyer with one big debt to retire and only modest forward spending in mind.

Not for

If you want rewards on everyday spend, this is the wrong card. There are no points, no cash back and no welcome offer. It's also a poor fit for travelers — the 3% foreign-transaction fee will erase any savings on overseas use. And if you can clear your balance in 12–15 months, a card with a lower transfer fee will likely net more savings even with a shorter window.

Transfer fee math: when this card actually wins

The 5% transfer fee is the catch. Take a $10,000 balance currently at 22% APR — roughly $1,800 a year in interest. Move it to the Diamond Preferred and you pay $500 upfront in transfer fees, then $0 in interest for 21 months if you make on-time payments. Net savings vs. staying put are roughly $2,650 over 21 months — a real win, but only if you actually pay it down. On a smaller $2,500 balance you'd pay $125 in fees to dodge maybe $400 in interest over the same window — still positive, but the math gets thinner. We are not a card issuer, and Citibank N.A. sets the final APR and credit limit.

The fine print: APR, fees and gotchas

Transfers must be completed within four months of account opening to qualify for the 21-month intro APR. After the intro period the variable APR moves to 17.49–28.24%. Late or returned payments may revoke the promotional rate immediately. There is no penalty APR distinct from the regular rate, but the 5% transfer fee (minimum $5) is non-negotiable. Cash advances carry a separate, higher APR with no intro period and a 5% or $10 fee, whichever is greater.

How to apply

Apply directly through Citi's website with the standard income, housing and Social Security inputs. Pre-qualification is available without a hard pull. Approval decisions are typically returned within 60 seconds, with mailed cards arriving in 7–10 business days. Once the card is in hand, initiate transfers from the Citi app — funds typically post to the old issuer within 4–14 days. Plan your payoff backward from month 21: divide the transferred balance by 21 and set that amount as your auto-pay floor.

Citi Diamond Preferred vs. closest competitor

The natural cross-shop is the U.S. Bank Visa Platinum, which matches the 21-month window and extends 0% to new purchases too — useful if you also want to finance a planned spend interest-free. For readers who can stomach a slightly shorter window in exchange for cash-back rewards, the Citi Double Cash is the same issuer with 18 months at 0% on transfers plus 2% back on every dollar spent. And the Wells Fargo Reflect remains the long-intro benchmark to beat.