A loose diamond is one of the most common — and most overlooked — jewelry problems. Most people don’t notice until the stone moves visibly, or worse, until it’s already gone. The prongs holding your diamond or gemstone in place wear down gradually, bend under impact, and eventually let go. The repair itself is straightforward. Getting there before the stone falls out is the part that matters.
Watch Technicians handles diamond prong repair, prong re-tip work, stone tightening, and loose stone repair near you at three walk-in locations in St. Louis. No appointment needed, free estimates on every piece. For our full jewelry repair services, see the jewelry repair St. Louis hub page, or visit our diamond prong repair service page and stone replacement service page for pricing details.
How to Tell If Your Diamond Is Loose
You don’t need a jeweler’s loupe to check. Run your fingernail gently over the prongs — if they catch fabric when you wear the ring, they’re snagging, which means they’re bent or worn thin enough that the tips are no longer smooth. If you can rock the stone slightly with your fingernail, it’s loose. If you look closely and see that a prong tip is missing or has worn flat, that stone is at real risk of falling out.
Other signs: a stone that reflects light differently than it used to (it may have shifted in the setting), a prong that looks visibly shorter than the others, or catching on hair and clothing when you reach for something. Any of these is worth a free inspection before it becomes a lost stone. If your diamond is loose, bring it in the same day — the longer it stays in a worn setting, the higher the risk of losing the stone entirely.
Prong Repair Services We Offer
Prong Retipping
When prong tips wear down — which they do over years of daily wear — retipping builds them back up to their original height and shape. The jeweler adds a small amount of metal to the worn tip, shapes it to match the other prongs, and polishes the result so the repair is invisible. Retipping is the right approach when the prong body is structurally sound but the tip has worn thin. It’s less expensive than a full prong replacement and preserves more of the original metal.
Full Prong Replacement
When a prong is cracked, broken off at the base, or worn to the point where retipping isn’t viable, full replacement is the correct repair. The old prong is removed and a new one is fabricated and soldered into position. On engagement rings and fine jewelry, we match the metal type, profile, and finish of the existing prongs so the replacement blends in. Prong replacement is more involved than retipping but is the more durable long-term solution when the damage warrants it.
Stone Tightening
A loose stone doesn’t always mean a broken prong — sometimes the prong tips just need to be pressed back down against the stone to re-secure it. Stone tightening is a quick procedure that closes the prongs back to their proper angle against the girdle of the stone. We inspect all the prongs while we have it to make sure none are thin enough to need retipping before we hand it back.
Stone Replacement
When a stone has already been lost, we source a replacement that matches the original as closely as possible — cut, size, and quality. For center diamonds, we discuss the options with you and show you what’s available before proceeding. For accent stones, melee diamonds, and side stones, we match the existing stones in the setting so the repair is seamless. We also handle colored gemstone replacement — sapphires, rubies, emeralds, and others. If you need stone replacement near me in St. Louis — or loose stone repair near me in the Creve Coeur, Des Peres, or Chesterfield area — visit our stone replacement page for more detail on that process.
What We Work On
We handle prong repair and stone work on engagement rings, wedding bands, anniversary rings, cocktail rings, and right-hand rings. We also do prong and stone repair on pendants, earrings, tennis bracelets, and any other fine jewelry with prong-set stones. Metal types include yellow gold, white gold, rose gold, platinum, and silver.
For vintage and heirloom pieces with unusual settings — bezel, pavé, channel, or milgrain — we assess the best approach before starting work. Older settings often require more careful handling than modern ones, and we’ll tell you that upfront.
Prong Repair and Ring Resizing at the Same Visit
If your ring also needs resizing, it’s worth doing both at the same visit. Ring resizing involves soldering — and combining it with prong work avoids a second round of heating and finishing. Bring it in and we’ll assess both at once. See our ring resizing in St. Louis page for sizing details and pricing.
How Much Does Prong Repair Cost?
Prong retipping starts at $35–$55 per prong depending on metal type. Full prong replacement starts at $65–$85 per prong. Stone tightening on a single stone starts at $25. Stone replacement pricing depends on the stone — we provide a quote after inspecting the piece and discussing your options. Free estimates before any work begins. See our jewelry repair cost guide for a full price breakdown across all jewelry services.
Diamond Prong Repair Near You — Three St. Louis Locations
Bring your ring or jewelry in to any of our three locations for a free prong inspection and estimate. No appointment needed.
- Creve Coeur (Flagship): 11483 Olive Blvd | Mon–Sat 9am–5pm | (314) 513-8455
- Des Peres: Inside West County Center | Mon–Thu 11am–7pm, Fri–Sat 10am–7pm, Sun 11am–6pm
- Chesterfield: Inside Dierbergs, 1728 Clarkson Rd | Mon–Sat 10am–5pm
Frequently Asked Questions About Diamond Prong Repair in St. Louis
How do I know if my diamond is loose?
The easiest check: run your fingernail over each prong. If it catches fabric or snags, the prong tip is bent or worn. If you can rock the stone with your fingernail, it’s loose. Visible prong tips that are flat, missing, or significantly shorter than the others are a clear sign. When in doubt, bring it in — a prong inspection takes two minutes and is always free.
What is a prong re-tip?
A prong re-tip — also called prong retipping — is the process of adding metal back to a worn prong tip to restore it to its original height and shape. Over years of daily wear, prong tips gradually wear down until they can no longer hold the stone securely. A re-tip rebuilds the tip using the same metal as the ring, then shapes and polishes it so the repair is invisible. It’s the standard repair when the prong body is still structurally sound but the tip has worn thin.
How much does prong repair cost in St. Louis?
Prong retipping starts at $35–$55 per prong. Full prong replacement starts at $65–$85 per prong. Stone tightening starts at $25. We provide a free estimate with exact pricing after inspecting the piece. See our jewelry repair cost guide for more detail.
What’s the difference between prong retipping and prong replacement?
Retipping adds metal to a worn prong tip — used when the prong body is structurally sound. Replacement removes the prong entirely and installs a new one — used when the prong is cracked, broken, or too worn to retip reliably. We assess which approach is appropriate when we inspect the piece and explain the reasoning before you decide.
Can you replace a missing diamond?
Yes. We source replacement diamonds matched to the cut, size, and quality of the original stone. For center diamonds, we show you options and discuss what’s available before ordering. For accent and side stones, we match the existing stones so the repair is seamless. We also replace colored gemstones — sapphires, rubies, emeralds, and others.
How long does prong repair take?
Stone tightening is often done same day. Prong retipping and replacement typically take one to three days depending on the complexity and metal type. Stone replacement timing depends on sourcing — we give you a realistic timeframe when you drop the piece off.
Do you repair prongs on platinum rings?
Yes. Platinum prong work requires different equipment and technique than gold — it’s a harder, denser metal that needs higher heat and specific soldering procedures. Our jewelers work with platinum regularly. Platinum prong repair is priced slightly higher than gold due to the material cost and additional work involved.
Do I need an appointment for diamond prong repair near me?
No. All three Watch Technicians locations are walk-in during business hours. Bring your ring or jewelry in and we’ll inspect it on the spot at no charge.
Walk in today for a free prong inspection — no appointment needed.