How Customer-Supplied Stones (Memo Goods) Work in a Custom Jewelry Order

A customer-supplied stone — an heirloom center diamond, a stone pulled from an old mounting, anything the retail customer already owns — gets handled as memo goods, not inventory. That means it is never commingled with a manufacturer’s own certified stock, it gets a written condition report with photos before anyone touches it, it carries a chain-of-custody number through every production stage, it is insured in transit and in production at its appraised value (not under a blanket studio policy), and there is a pre-agreed plan for what happens if the stone doesn’t fit the approved design once it’s actually in hand. If your manufacturing partner can’t describe that process to you in specific terms before you ship a client’s stone, that’s the question to press on before you send anything.

This is a different workflow than ordering a piece built around certified diamonds from a supplier’s own stock. The stone isn’t being sold to you. It’s being handed to a third party for a service — cutting a seat, setting it, sometimes recutting or re-polishing it — and then handed back. The manufacturing partner never owns it, never invoices for it, and treats it as a liability on their books the entire time it’s in the building.

Why This Comes Up in Custom Orders

Retail jewelers run into customer-supplied stones constantly: a grandmother’s engagement diamond going into a new setting, a stone salvaged from a marriage that didn’t work out, an inherited pendant stone the customer wants reset as a ring. The jeweler sells the design and labor. The stone itself is the customer’s property from start to finish.

The mistake some shops make is treating that stone the same way they’d treat a diamond drawn from certified inventory — same intake, same tracking, same casual handling. It isn’t the same. A stone from inventory that gets scratched or chipped in production is a loss the manufacturer absorbs and replaces from stock. A customer’s stone that gets damaged is a claim against a piece of property that can’t be replaced, and often can’t be fully valued after the fact if there’s no documentation of its condition beforehand.

Intake: Condition Report and Chain of Custody

The intake step is where most of the risk in a memo-goods job gets managed or mismanaged. A serious manufacturing partner does this before the stone goes anywhere near a bench.

What Gets Documented at Intake

• Photographs of the stone loose, under magnification, from multiple angles, showing any existing inclusions, chips, or wear at the girdle or culet
• Weight taken on a calibrated scale at intake, not estimated from a prior appraisal
• Measurements — diameter, depth, table percentage — recorded independently of whatever paperwork came with the stone
• Cut identification — this matters more than people expect. An heirloom stone is frequently an Old Mine or Old European cut, sometimes a Rose Cut or another antique-era style, and the condition report should describe the actual cut observed, not just copy a label from an old receipt
• Existing certification, if any — a lab report from IGI, GIA, or another grading lab traveling with the stone, logged and photocopied, not just glanced at
• A unique job/lot number assigned to the stone that follows it through every stage — CAD, wax, casting, setting, QC, shipping — so at any point someone can answer “where is this stone right now” without asking around

That condition report is signed off by both sides before work starts. It’s the reference point if any dispute comes up later about whether damage existed before the job began or happened during production.

Chain of Custody Through Production

Once intake is done, the stone should never move between departments without a logged handoff. In practice that looks like a stone travel bag or vial with the job number on it, checked in and checked out at each station: design/CAD confirmation, stone-setting, polishing, final QC. This isn’t paperwork for its own sake — it’s how a shop can tell you, with certainty, which bench the stone was on at any given hour, and it’s what prevents a memo stone from getting mixed into a bin with certified inventory or another customer’s job.

Insurance During Transit and Production

Two separate exposure windows need separate coverage, and jewelers should ask about both explicitly rather than assuming a manufacturer’s general liability policy covers a customer’s stone.

Transit coverage applies from the moment the stone leaves the retail counter until it’s signed for at intake, and again on the return trip once the finished piece ships back. This is typically handled through insured courier services (registered mail with declared value, or a jeweler’s carrier like the ones used for memo shipments industry-wide) rather than standard parcel shipping. The declared value should match a current appraisal, not a guess.

In-production coverage applies while the stone is on-site — during CAD fitting, casting, setting, and polishing. This should be a specific rider or endorsement tied to the appraised value of that individual stone, not an assumption that a shop’s general policy automatically extends to customer property. Ask your manufacturing partner directly: is there a policy that covers customer-supplied stones by name, and what’s the per-item limit? If they can’t answer that in one sentence, get it in writing before you ship anything.

What Happens If the Stone Doesn’t Fit the Intended Design

This comes up more than people expect. A customer’s stone can differ enough from its original paperwork — in diameter, in depth, in the exact placement of the culet — that the CAD design approved on paper doesn’t seat the actual stone correctly once it’s in hand. Common triggers:

• The stone is a fraction of a millimeter off from the dimensions used to build the CAD model
• An antique cut (Old Mine, Old European, or similar) has a deeper pavilion or different proportions than a modern round of the same carat weight, which changes prong height and basket depth
• The girdle has more wear or an irregularity that changes how a bezel or channel needs to be cut
• The customer’s stone is slightly smaller or larger than what they remembered, changing the halo or shoulder-stone layout around it

A manufacturing partner should catch this at the CAD-fitting stage — ideally before casting, never after setting. The standard sequence is: intake measurements get compared against the CAD file before the design is finalized, and if there’s a mismatch, the design goes back for a quick revision rather than forcing a stone into a seat it wasn’t built for. This is exactly why the CAD-approval step in the how it works process exists as its own checkpoint — it’s the last point where a fit problem is cheap and reversible.

If a mismatch is only caught after casting, the fix is almost always on the metal side — reworking the setting, deepening a basket, adjusting prong height — not on the stone. A customer’s stone should never be recut or altered to fit a design without separate, explicit sign-off, because that’s an irreversible change to someone else’s property and a decision that belongs to the retail jeweler and their client, not the manufacturing partner.

Working Alongside Certified Inventory

Memo jobs frequently aren’t just “reset this one stone.” A customer wants their inherited center stone in a new setting with a halo, or updated to a three-stone design with new side stones. That means the finished piece combines the customer’s memo stone with newly purchased material — typically drawn from a supplier’s own certified inventory or melee stock for accent work.

These two categories need to stay clearly separated on the job ticket and in billing:

• The memo stone is never invoiced. It’s a service line item (cutting the seat, setting, polishing) plus insurance, and it ships back as the customer’s own property.
• New stones added to the design — halo diamonds, side stones, melee for pavé — are ordered and invoiced normally, whether that’s certified stones 0.30ct and up from cert diamonds or uncertified melee parcels for accent work. Melee is graded to a color/clarity baseline as parcel goods; it isn’t individually certified the way a 0.30ct+ solitaire is, and a condition report shouldn’t imply otherwise.

Keeping those two ledgers distinct avoids the single most common billing dispute in memo jobs: a retail jeweler getting an invoice that looks like it’s charging for the customer’s own stone.

A Practical Checklist for Jewelers

Before shipping a client’s stone to any manufacturing partner, confirm:

1. A written intake process exists — photos, weight, measurements, cut identification — and you’ll receive a copy
2. A specific job/lot number will track the stone through every production stage
3. In-production insurance is confirmed in writing, with a stated limit tied to the stone’s appraised value
4. Transit insurance is arranged on both legs of the shipment, with signature confirmation at each end
5. There’s a defined checkpoint — before casting — where stone dimensions are verified against the CAD file
6. Any fit problem gets resolved on the metal side by default, with your explicit sign-off required for anything that touches the stone itself
7. The memo stone and any newly purchased stones in the same piece are billed and documented separately

If a manufacturing partner treats these as unusual questions rather than routine ones, that’s worth noting before you commit a client’s stone to them. For a partner set up to run memo work alongside standard custom jewelry production under one process, this is routine intake, not a special exception — reach out through contact us or apply for trade access to walk through how a specific job would be handled.

Frequently Asked Questions

Is a customer-supplied stone treated as inventory once it arrives at the manufacturer?

No. It’s logged as memo goods — property in the manufacturer’s custody for a service, not stock the manufacturer owns or can sell. It’s tracked separately from certified inventory at every stage, from intake through shipping, and it never appears on an invoice as a purchased item.

Who pays for insurance on a customer’s stone while it’s in production?

This should be spelled out before the job starts, not assumed. Most manufacturing partners carry a specific in-production insurance rider for customer-supplied stones and build that cost into the service quote, separate from any general shop policy. Ask for the coverage limit and confirm it matches the stone’s current appraised value, not an old or estimated figure.

What if the stone is damaged during setting?

A documented condition report from intake is what makes this resolvable. If damage occurs during production, it’s assessed against the original photos and measurements, and the manufacturer’s insurance is what covers the claim — not the customer’s or retailer’s own policy. Without an intake record, there’s no reliable way to prove when damage occurred, which is why skipping that step is the biggest risk in handling memo goods.

Can the manufacturer recut or repolish a customer’s stone if it doesn’t fit the setting?

Only with explicit, separate sign-off from the retail jeweler and their client. The default response to a fit problem is to adjust the metalwork — the basket depth, the prong height, the bezel width — not the stone. Any change to the stone itself is treated as a distinct decision because it’s an irreversible alteration to property the manufacturer doesn’t own.

Does a memo stone job still get a fast turnaround?

The 4-6 day window some manufacturing partners quote applies to CAD-approved custom jewelry production — the span from an approved design to a finished piece. Intake, condition reporting, and CAD-fit verification for a customer-supplied stone happen before that clock starts, since the design can’t be finalized until the actual stone’s measurements are confirmed against it.

Can new certified stones be added to a piece alongside a customer’s memo stone?

Yes — this is common for halo or three-stone designs built around an inherited center stone. The memo stone and any newly purchased stones (certified diamonds or melee for accent work) are tracked and invoiced on separate lines, so the finished piece combines both without conflating what the customer already owned with what they’re buying new.