What should I do if the diamond falls out of the setting?

First, stop everything. Find the diamond. Use a flashlight, even in daylight - stones glint against the floorboard crack you’d swear wasn’t there. Check your cuffs, the sink trap, your car floor mat. Don’t vacuum until you’ve looked.

Last November a client named Javier came in white-faced because his 1.07 carat oval had vanished from its halo. He’d been raking leaves. We found it three hours later in the grass, a millimeter from the storm drain. Pure luck. That kind of panic is avoidable.

Do not try to glue the stone back in. I’m not being dramatic. Superglue clouds the pavilion, it off-gasses into the setting, and the bond is worthless when the metal flexes. I’ve had to soak a ring in acetone for two days to undo someone’s DIY fix before I could even start the real work. The extra bench time cost the client more than the original reset would have.

Take the ring off. Put the loose stone in a small ziplock bag, then put that bag inside a sturdy container - not loose in your pocket, not wrapped in a tissue that will get thrown out. If the stone is tiny, like a pavé accent, crush the bag flat so it can’t hide in the corner.

Look at the setting. Is a prong snapped clean off, or just bent? Is there a chip on the stone’s girdle? Snap a photo with your phone - macro mode, good light. I’ll want to see it before you walk in.

Now bring the ring and the stone to a jeweler. Not the chain-store counter where they ship everything out. A working bench jeweler who will sit across from you and look through a loupe. What I’ll do: check every prong under 10x, test for wear, look for the reason it let go. A single loose prong is often a $60-$120 fix if I can retip and reset. If the prongs are paper-thin and three of six are compromised, I’ll recommend rebuilding the head entirely - $180 to maybe $400 for a complex hand-fabricated head in 18k. I’ll be honest if the whole setting was a bad match for the stone from the start.

If you have insurance, call them before any work starts. Some policies require a jeweler’s assessment in writing, and you don’t want to find that out after the diamond is already back in and the invoice says “reset.” Jewelers Mutual, BriteCo, Lavalier - they all handle lost-stone claims, but if the repair cost is less than your $500 deductible, don’t file it. A single claim can bump your premium for years.

And if the stone is truly gone - down a drain, out a car window - you’re not the first. I once helped a man search a Chicago alley with a sieve and a headlamp. The diamond was found near a cigarette butt, unscathed. That said, most drains are not that kind. If it’s lost, pull out your appraisal and your GIA report number. You’ll need that documentation to buy a replacement stone without getting taken. The sentimental part doesn’t get a discount.

The time to think about loose prongs is not after the diamond is gone. I offer a free inspection with cleaning every six months. Clients who take me up on it rarely lose stones. Most don’t.