Engagement Ring OEM & ODM Manufacturing
Alpha Jewelry is a precious-metal jewelry factory in Panyu, Guangzhou, China, with 15+ years of experience. We make engagement rings for brands, designers, retailers and individuals under OEM, ODM and private label. MOQ is 1 piece. Rings ship 7–14 days after CAD approval. Payment is full payment before production; we do not work on deposit terms. Send a sketch, reference image or CAD to start.
OEM vs ODM for engagement rings
OEM means you bring the design and we manufacture it; ODM means you start from our design work and adapt it. The table below sets out the difference in practical terms.
| OEM | ODM | |
|---|---|---|
| Who provides the design | You provide a sketch, reference image or CAD | We develop the 3D design and CAD from your direction |
| Who it suits | Brands and designers with a defined ring design | Brands and retailers building a series without in-house CAD |
| Process difference | Your design goes to CAD confirmation, then casting | Design and CAD development come first, then CAD confirmation, then casting |
Both routes run through the same production steps once the CAD is confirmed. If you already have a finished CAD file, OEM is the shorter route. If you have a mood board or a rough sketch, ODM gives you the 3D design and CAD work before anything is cast.
As an engagement ring OEM manufacturer and engagement ring ODM partner, we work from your files or develop them with you. We are an engagement ring manufacturer China-based buyers contact directly, and we handle both routes in one facility in Panyu, Guangzhou.
What we can make
We work in the metals and stone types listed below. If your ring falls within these categories, we can quote it.
| Category | Options |
|---|---|
| Metals | 9K, 10K, 14K, 18K, 22K gold (yellow, white, rose); Pt950; 925 silver |
| Gold plating | Vermeil service available |
| Centre stones | Natural diamond, lab-grown diamond, moissanite, colored gemstones |
| Lab-grown diamond quality | DEF color, VVS/VS clarity |
| Certificates | Centre stones over 0.5 ct come with an IGI report; moissanite centre stones come with a GRA certificate |
We do not publish a fixed style list, because engagement rings are built to your design rather than picked from a catalogue. Tell us the metal, the centre stone type and the ring size, and the CAD stage defines the rest.
From your design to finished ring
The process has six steps. Each one has a clear input from you and a clear output from us.
1. You send your design input. You provide a sketch, a reference image or a CAD file. This is the starting point for everything that follows.
2. 3D design and CAD confirmation. We produce the 3D design and CAD. You review the CAD and confirm it. Production does not start until the CAD is confirmed.
3. Casting. The confirmed CAD goes to casting in your chosen metal.
4. Stone setting. The centre stone and any other stones are set into the cast ring.
5. Polishing. The ring is polished to finish.
6. Quality check and shipping. The ring is checked and then shipped.
For a fuller view of how orders run end to end, see our customized jewelry cooperation process. If you need 3D design and CAD work as a standalone stage, that is covered on our 3D jewelry design service page.
MOQ, lead time and payment
MOQ is 1 piece. You can order a single engagement ring. There is no minimum order quantity for the ring itself. Custom logo packaging has a separate MOQ of 100 pieces.
Lead time for rings is 7–14 days after CAD confirmation. The clock starts when you confirm the CAD, not when you first send a sketch. Time spent on design revisions and CAD confirmation sits before that window.
Payment is full payment before production. We do not run a deposit model. Production begins after payment is received in full.
These three terms apply to engagement rings specifically. For other product categories, ask us directly rather than assuming the same lead time.
Stones and certificates
We set natural diamonds, lab-grown diamonds, moissanite and colored gemstones. Certificate scope depends on the stone type and, for lab-grown diamonds, on carat weight.
Lab-grown diamonds. We use DEF color, VVS/VS clarity lab-grown diamonds. Only centre stones over 0.5 ct come with an IGI report. Smaller lab-grown stones, and lab-grown stones used as accents, do not carry an IGI report.
Moissanite. Moissanite centre stones come with a GRA certificate.
If a certificate matters to your listing or your customer communication, tell us the centre stone type and carat weight at the quote stage so the scope is clear before production. More on stone options is on our lab-grown diamond jewelry page.
Quality checks before shipping
Every ring is checked before it leaves the factory.
If you have your own acceptance criteria, send them with your design input so they can be built into the CAD confirmation stage rather than raised after casting.
What to send us for a quote
To quote an engagement ring, send the following:
- A reference image, sketch or CAD file
- Metal and color (for example 18K rose gold, or Pt950)
- Centre stone type and specifications (natural diamond, lab-grown diamond, moissanite or colored gemstone; carat and quality where relevant)
If any item is still open, say so and we will work through it at the CAD stage.
OEM, ODM and private label
OEM and ODM are the two production routes described above. Private label is a separate arrangement where the ring carries your brand rather than ours. Many engagement ring programs combine the two: an ODM-developed design produced under your private label.
We also run a dedicated private label engagement rings service and a custom engagement ring manufacturer page for buyers who want a single ring built to their own design. For a side-by-side explanation of all three models, read OEM vs ODM vs private label jewelry.
As a custom jewelry OEM ODM China supplier, we handle both routes from one factory in Panyu, Guangzhou. If you are sourcing an OEM ODM moissanite ring supplier with CAD design, the same process applies: send your design input, confirm the CAD, and we cast, set, polish, check and ship.
Start your engagement ring project
We will confirm the route (OEM or ODM) and move to CAD.
Frequently asked questions
Yes. Our MOQ is 1 piece, so a single engagement ring can be ordered as a sample. The same process applies as for larger runs: you send a sketch, reference image or CAD, we confirm the CAD with you, then cast, set, polish, check and ship. Rings ship 7–14 days after CAD confirmation.
Alpha Jewelry, in Panyu, Guangzhou, offers both OEM and ODM for engagement rings, with 15+ years of experience. OEM means you supply the design; ODM means we develop the 3D design and CAD from your direction. MOQ is 1 piece, and rings ship 7–14 days after CAD confirmation.
Only centre stones over 0.5 ct come with an IGI report. We use DEF color, VVS/VS clarity lab-grown diamonds. Smaller lab-grown stones and accent stones do not carry an IGI report. Moissanite centre stones come with a GRA certificate. Tell us the carat weight at quote stage so the scope is clear.
No. Engagement rings cannot be resized after delivery. Ring size is fixed at the CAD confirmation stage, so confirm the size before you approve the CAD. If you are unsure between two sizes, settle it before confirmation rather than after the ring is cast and finished.
Payment is full payment before production. We do not use a deposit model. Production starts once payment is received in full, and the 7–14 day ring lead time runs from CAD confirmation. Contact us on WhatsApp +86 185 2059 5760 or at alpha_jewelry@163.com to arrange payment.
In OEM, you provide the design as a sketch, reference image or CAD, and we manufacture it. In ODM, we develop the 3D design and CAD from your direction, you confirm the CAD, and we manufacture. Both routes share the same casting, setting, polishing, checking and shipping steps.