A girl’s best friend? Diamonds.

A cliche that leaves fiances-to-be in need of their own best friend.

Which is where diamond expert Kerry Gaynor comes in. For two years now, she’s been helping people find the best rock at the lowest costs, and educates her clients about the traps — the enhanced lighting, the inflated prices — that spring up when one buys diamonds retail.

Although she specializes in engagement rings, she also finds stones for pendants and earrings, including other gems like sapphires and rubies. You know, the bauble-for-the-heck-of-it that happens so often. (Um, yeah.)

Make an appointment with Kerry, and she’ll give you advice no other dealer will. For instance: Nobody crosses a room to tell you that your diamond is beautiful because of its perfect rating. They usually fixate on size.

Now, that’s a best friend we could all use.

Kerry Catherine Engagement Rings (312-656-0139 or kerryrings.com). By appointment only.