There are excellent coin dealers and terrible ones, online and on Main Street alike. Here is the full checklist for telling them apart, and yes, we expect to be graded on it too.
A dealer’s website and paperwork tell you most of what you need before a single conversation. Look for a physical address you can verify, a consistent phone number and domain, plainly written policies for shipping and returns, and any disclaimers about pricing. Vagueness is a choice; a dealer who hides the basics has decided the basics don’t help them.
Then read how they talk about money. A trustworthy dealer in this industry sells coins as collectibles and says so. Language promising appreciation, "guaranteed" outcomes, or urgent windows to buy is the single loudest warning in the entire hobby, loud enough that federal consumer-protection agencies specifically describe it in their fraud guidance.
The fastest character test of any dealer, in a shop or on a phone, is what happens when you say "let me think about it." A professional says "of course" and means it, because good coins do not need cornering tactics to sell. Countdown clocks, "this price only if you decide now," and manufactured scarcity all fail this test instantly.
Related: a real dealer welcomes your questions and enjoys answering them. Ask why a coin costs what it costs. Ask what the return policy actually covers. Ask how pricing relates to the current metals market. The quality of the answers, patient, specific, unhurried, is the expertise. Anyone can claim knowledge; only knowledge can explain itself.
Verifiable claims beat impressive-sounding ones. A physical address you can find on a map. A phone number a human answers. Grading language that defers to independent services like PCGS and NGC rather than the dealer’s personal say-so. Buyback terms and return windows in writing before you pay. None of these guarantees virtue, but each one is a fact someone chose to put on the record, and patterns of on-the-record facts are how trust is actually built.
Finally, judge how a dealer behaves when the roles flip. A dealer who is respectful when selling to you but dismissive when buying from you has shown you their real face. The best in this business treat a $50 transaction and a $50,000 one with the same manners, because they are playing a decades-long game called reputation.