Lab Grown Diamonds
Lab Grown Diamonds Private Label: Exclusivity, Dieline and the Reorder for Multi-Door Chains
A retailer in Calgary placed a trial order and found the supplier could not produce a second lot to the same plating thickness. The order was not lost
A retailer in Calgary placed a trial order and found the supplier could not produce a second lot to the same plating thickness. The order was not lost on price. It was lost on a specification nobody wrote down. This piece looks at lab grown diamonds from the buyer's side of the table: what the promise means at the bench, what it costs to get it wrong, and how to write a brief a factory can be held to.
Six Questions That Reveal Whether a Supplier Can Actually Deliver
A supplier is a production system, not a price list. The questions that matter are the ones about repeatability, because your second order is what your customer judges you on.
We answer the six questions below with numbers and with a physical sample, and we expect to be asked for both.
What the Industry Standard Delivers, and Where It Breaks
The default offer in this category is a stock photo, a unit price and a thirty-day promise. That works for one order and stops working on the second, because a stock photo cannot specify 10 mohs.
| Comparison | Common practice | What we hold | Why it matters |
|---|---|---|---|
| Question | Weak answer | What we provide | |
| Capacity | "plenty" | monthly piece count per line | |
| Repeatability | "same quality" | plating and weight tolerance | |
| Traceability | "we check everything" | lot and rack record | |
| References | logos | named buyers who will talk |
How We Answer Them Before You Place an Order
Certificate-to-stone traceability is the number we publish per lot. It is the one a buyer can check with a caliper and a loupe in ten minutes, and the one that decides whether a reorder is a formality or a negotiation.
- Lot and rack reference on every carton
- 10 mohs declared on the invoice, not assumed
- One plated sample approved per rack before the run
- Stone parcel photographed and hue band stated in writing
The Reorder Sheet We Hand Back
Every reorder comes back with the original sheet: alloy batch, stone parcel reference, plating rack number, setting team, measured certificate-to-stone traceability. It is four lines and it removes the argument about what "the same" means.
Buyers who keep those four lines can audit a fifth lot in an afternoon. Buyers who do not are comparing two photographs and hoping.
Packaging and the First Thirty Seconds
The carton is the first physical impression. An anti-tarnish pouch, a cavity insert and a stone-side-up orientation cost a few cents and prevent most of the transit damage we see on lab grown diamonds.
Loose fill is the main cause of bent posts and scratched faces. It is cheaper than a cavity insert by about two cents a unit, which is the worst trade in the category.
Why We Publish the Numbers
Publishing certificate-to-stone traceability and the plating micron figure is uncomfortable for a factory that expects to be judged on photographs. It is comfortable for a buyer who has to defend a reorder to a boss.
The number is the argument. A supplier who will not publish one is asking you to trust the photograph instead.
The Three Failure Modes We See Most
On lab grown diamonds the three failures that come back most often are blue nuance in CVD goods, strain lines under cross-polarised light, and report numbers that do not match the laser inscription. Each has a root cause upstream of the bench, which is why sorting finished pieces never fixes the rate.
Prong wear traces to wire gauge and setting pressure. Stone tilt traces to the bearing surface being cut by hand instead of by burr. Plating burn-off traces to rack contact points, not to the tank.
Tolerance Stack: Where 0.1mm Becomes a Complaint
Tolerance compounds across operations. A casting that runs 0.15mm wide, a setting that shifts the stone 0.1mm, and a polish that removes 0.05mm of surface can put a lab grown diamond outside the size the customer ordered without any single step being out of specification.
That is why we hold the stack at the casting rather than at the finish. Tightening the last operation cannot recover tolerance that was already spent at the first.
The Reorder Sheet We Hand Back
Every reorder comes back with the original sheet: alloy batch, stone parcel reference, plating rack number, setting team, measured certificate-to-stone traceability. It is four lines and it removes the argument about what "the same" means.
Buyers who keep those four lines can audit a fifth lot in an afternoon. Buyers who do not are comparing two photographs and hoping.
What to Send Us to Get a Real Quote
A sketch or reference photo, the metal and finish, the stone size and grade, the setting type, the target quantity and the tolerance you will accept. With those six fields we return a drawing and a price in three days.
Without them we can only quote a range, and a range is what turns into a dispute at delivery. We would rather send the drawing back with the tolerances printed on it than send a number that will not hold.
Why the Cheapest Sample Is the Most Expensive Decision
A sample that costs nothing is usually made from a stock tree with a stone the factory already had. It shows you the catalogue, not the production.
We charge samples at cost and credit them against the first order. It is a small amount of money that buys you a truthful answer about what your reorder will look like.
The Six Cost Lines and Which One Moves
Metal, stone, labour, plating, packaging and freight. On a fifty-piece run the first two carry roughly half the cost, labour about a quarter, and the rest the balance. A quote that undercuts the market by thirty per cent has moved one of the last four.
Plating and packaging are the cheapest to cut and the hardest for a buyer to see, which is exactly why they get cut. We publish the micron figure so the cut is visible before the order rather than after the first complaint.
What to Send Us to Get a Real Quote
A sketch or reference photo, the metal and finish, the stone size and grade, the setting type, the target quantity and the tolerance you will accept. With those six fields we return a drawing and a price in three days.
Without them we can only quote a range, and a range is what turns into a dispute at delivery. We would rather send the drawing back with the tolerances printed on it than send a number that will not hold.
What It Costs and How Long It Takes
Fifty pieces per design is the working minimum on lab grown diamonds. A sample runs three to five days, bulk fifteen to twenty days under 500 pieces, and a custom mould twenty-five to thirty days from drawing approval. Payment is 30% deposit with the balance against the bill of lading copy.
If the order is below fifty, the setup cost per piece roughly doubles because the casting tree and the plating rack are fixed costs. That is arithmetic, not a policy to negotiate around.
| Item | Value | Note |
|---|---|---|
| MOQ | 50 pcs / design | sizes and colours can be split |
| Sample | 3-5 days | one piece, approved before the run |
| Bulk lead time | 15-20 days | under 500 pieces |
| Custom lead time | 25-30 days | from drawing approval |
| Payment | 30% / 70% | balance against B/L copy |
| Port | Guangzhou / Shenzhen | export from Wuzhou |
Frequently Asked Questions
How long have you been manufacturing?
The Wuzhou operation has run since 2009, with casting, setting, polishing and plating on site rather than subcontracted. That matters because a subcontracted plating line is where thickness drifts.
Can I visit the factory?
Yes. Visitors are welcome in Wuzhou with two weeks' notice so the line you want to see is running production and not a cleaned-up demonstration cell.
What is your capacity per month?
Roughly 60,000 pieces across silver and gold lines, with moissanite setting capacity around 25,000 stones per month. Capacity is quoted per line, not as one number.
Will you sign an NDA and a quality agreement?
Yes. The quality agreement states the AQL per check point and the remedy, which is more useful than an NDA alone.
Can you produce a second lot identical to the first?
Yes, if we hold the four inputs: alloy batch, stone parcel, plating tank and setting team. The reorder sheet records all four, so the check happens against a document rather than against a memory.
What happens if the lot arrives outside the agreed tolerance?
Photograph the piece with a scale and reference the lot line. Above the agreed AQL we replace and cover freight; inside it we replace the affected units inside ten days.
About the Manufacturer
HOLYCOME by Wuzhou HengliLai Jewelry Co., Ltd. runs casting, setting, polishing and plating on one site in Wuzhou, Guangxi, the artificial gemstone cluster that supplies most of the trade. Monthly capacity is roughly 60,000 pieces across silver and gold lines. Buyers can reach the trade desk at service@holycome.com or on WhatsApp at +86 18078079070, and a factory visit can be arranged with two weeks' notice.
Next Step
If you are pricing lab grown diamonds for a season, send the quantity per design, the stone grade you need and the date you need it on the shelf. We will return a drawing, a landed cost and a production date within three days, and a physical sample before you commit to a run. Samples are charged at cost and credited against the first order.
Related reading: Moissanite Wholesale: The Questions Retailers Actually Ask, Auditing a Jewelry Supplier Before the First Order: The Checklist, Jewelry Import Duties: A Plain-Language Overview for First Buyers
