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There's a bottle in most kitchens that gem labs use quietly behind the scenes, and most of what it actually does never makes it into the conversation with paying customers. It's cheap, it's ordinary, and in the right situation it can tell you something a lab would otherwise charge you to find out.

In this video I go through thirteen things about white vinegar that matter if you test, clean, or identify stones — what it reacts to, what it doesn't, where it gives you a real answer and where it leads you wrong if you trust it too far. One of these, on its own, can save you a ninety-dollar lab test if you know how to read it correctly.

None of this replaces a real lab when the stakes call for one. It's just the part of the process most gem labs don't bring up unless you already know enough to ask.