NYC Custom Jewelry Manufacturer for Jewelers Lab-Grown & Natural Diamonds
Say yes to every custom request.
Guru Diam is a custom jewelry manufacturer for jewelers, retailers and designers at 36 W 47th St, Suite 601A, in New York's Diamond District. We build around lab-grown and natural diamonds from our own inventory: a 3D CAD render within 24 hours, then 4–6 working days from approved CAD to a finished, set and polished piece. No MOQ, paid per piece. Trade only.
Your client's sketch
Day 0
Drag to build it
Our custom jewelry manufacturing process
From your client's sketch to a finished piece, made in-house in New York and India.
- 01
Send the spec
Piece, metal, center diamond and finger size. A sketch or photo is enough.
- 02
3D CAD in 24 hours
We pull the certified center from 10,000+ diamonds in stock, or source it to spec, and send a 3D CAD render within 24 hours.
- 03
You approve the CAD
Nothing is cast until you approve it. Changes to the render are made before production starts.
- 04
Casting
Your piece is cast in 14K or 18K gold, platinum or silver.
- 05
Setting with matched diamonds
Center, matched pairs and calibrated melee come from the same house: melee within ±0.05–0.10 mm, pairs within ±0.1–0.2 mm.
- 06
Polish, finish and ship
Finished in 4–6 working days from approved CAD (complex pieces may take 2–3 weeks). Track every stage in the live order portal.
Your client asks. You answer in 20 seconds.
Clock starts at CAD sign-off. A clean solitaire finishes at the 4-day end; a halo, full eternity, or matched fancy-shape build pushes to 6. Every piece is quoted to spec.
The highest-margin work on your counter is the hardest to staff.
Custom is where AOV is highest and price sensitivity is lowest, and it's exactly the work a standard case can't fill. Vintage and antique-inspired requests keep walking in: Old Mine and Euro Cut diamonds, bezels, toi-et-moi, fancy shapes, colored centers.
These are the requests that walk in and walk back out, because building them in-house means a bench, a CAD operator, casting equipment, deep diamond inventory, and hard-to-source matched melee.
Treat custom as sourcing and fulfillment, not manufacturing.
Any metal. Any cut. All under one roof.
Engagement & Solitaires
The core custom request, built around a certified center diamond from live inventory.
Three-Stone & Halo
Center plus matched sides and calibrated melee, agreed to spec.
Eternity & Wedding Bands
Full or partial, calibrated all the way around.
Tennis Bracelets & Necklaces
Matched lines held to consistent size and color.
Studs & Matched Pairs
Pairs sourced together, mirror-matched in cut and symmetry.
Fancy-Color & Antique Cuts
Old Mine, Euro Cut, Rose Round, Portuguese and colored centers from 10,000+ certified diamonds, or sourced to spec.
If they can sketch it, we can build it.
Spec & Diamond
Center diamond selected from live inventory; metal, finger size, and design intent locked.
4–6 working days under one roof, vs the 15–20+ days typical across separate vendors.
Everyone else, then there's Guru Diam.
Other custom routes · 3–4 vendors + shipping legs
15–20+ daysDiamonds sourced deal by deal, a slow email loop on CAD, finger-pointing across vendors.
Guru Diam · zero hand-offs, one account manager
4–6 working days10,000+ certified diamonds in-house, 24-hr CAD render, live order portal.
+ The full comparison
| Other custom routes | Guru Diam | |
|---|---|---|
| Turnaround | 15–20+ days | 4–6 working days from approved CAD |
| Diamonds | Sourced separately, deal by deal | 10,000+ certified in-house, or sourced to spec |
| Matched melee & pairs | Yours to source and match | Calibrated in-house: melee ±0.05–0.10 mm, pairs ±0.1–0.2 mm |
| CAD render | Slow email loop | 3D render within 24 hours |
| Minimum order | MOQs & deposits common | None, one piece, paid per piece |
| Order tracking | Chasing vendors by email | Live order portal |
| Hand-offs | 3–4 vendors + shipping legs | Zero, all under one roof |
| Accountability | Finger-pointing across vendors | One dedicated account manager |
We run the back room. You keep the counter.
We are the bench. No jeweler to hire, no equipment to buy, no setting inventory to carry.
One finished piece against one client's spec, paid per piece.
A 3D CAD render within 24 hours. Nothing is cast until you approve it.
Live Order Portal
Log in and watch each order move CAD → cast → set → finish in real time.
24-Hour CAD Approval
A dimensioned 3D render within 24 hours. Nothing is cast until it's approved.
Dedicated Account Manager
One account manager on your job, with real-time updates over WhatsApp.
Accents that agree with the center, not parts that look assembled.
The center diamond, the matched pairs, and the calibrated melee all come from one house, held to trade tolerance.
Cast, set and polished in one room.
4–6 working days from approved CAD. Track every stage in the live order portal.
Request a Custom QuoteSend us the spec. We'll build the rest.
- 3D CAD render in 24 hoursNothing is cast until you approve it.
- 4–6 working days from approved CADComplex pieces may take 2–3 weeks; we tell you up front.
- A dedicated account managerUpdates on WhatsApp and in the live order portal.
- No MOQ, paid per piece14K or 18K gold, platinum or silver.
Questions from the trade.
Can I offer custom without a bench jeweler? +
Yes. We are the bench. You stay the storefront. Guru Diam runs the capital-intensive back end (certified diamonds, CAD, casting, setting, finishing). No jeweler to hire, no casting equipment to buy, no setting inventory to carry.
Is there a minimum order? +
No MOQ. Order a single finished piece against a single client's spec, paid per piece. The fixed cost of an in-house bench becomes a variable, per-piece cost.
How fast is it? +
The CAD render is delivered within 24 hours. Then it's 4–6 working days from approved CAD to a finished, set and polished piece, versus the 15–20+ days typical when work routes through separate sourcing, CAD, casting and setting vendors. Complex pieces may take 2–3 weeks. The clock always starts at CAD sign-off.
How do I know the side diamonds will match the center? +
They come from the same house, held to trade tolerance: calibrated melee within ±0.05–0.10 mm, matched pairs within ±0.1–0.2 mm in size and about one color grade. Sourcing the center, the pairs and the melee under one roof prevents the mismatches that wreck multi-vendor custom.
Can you use a diamond you don't have in stock? +
Yes. If the diamond your client wants isn't in our 10,000+ certified diamonds, we source it, or cut it, to your spec.
Can I track my order? +
Yes. Every custom order shows in the live order portal, CAD → cast → set → finish, and your dedicated account manager keeps you updated on WhatsApp.
Do I need to be verified trade? +
Yes. Guru Diam is a B2B wholesale supplier and custom manufacturer for the trade only: verified jewelers, retailers, designers and manufacturers. Open a trade account to get started.
Is custom priced upfront? +
Every custom piece is quoted to spec. Send the design intent, metal, center diamond and finger size, and the Custom Desk returns a quote with the CAD render.
Where is your custom jewelry made? +
Custom jewelry is produced in-house in New York and in India: CAD, casting, setting and polishing. Our office is at 36 W 47th St, Suite 601A, in New York's Diamond District, with a second office in downtown Los Angeles at 607 S Hill St #241. Showroom visits in NY and LA are by appointment.
Do you make custom jewelry with lab-grown and natural diamonds? +
Yes. We build with both certified lab-grown and certified natural diamonds from our own inventory of 10,000+ IGI and GIA certified diamonds. If the diamond you need isn't in stock, we source it, or cut it, to your spec.
Which metals do you work in? +
14K and 18K gold, platinum and silver.
Can you make custom jewelry under my brand? +
Yes. Your piece ships under your brand to your client. We are the manufacturer behind the counter; you keep the client and the margin.
What do I need to send to start a custom order? +
The piece, metal, center diamond and finger size. A sketch or a photo is enough. Send it through the Custom Quote form or WhatsApp it to the Custom Desk at +1 (929) 340-3449, and the 3D CAD render comes back within 24 hours.
Private label custom jewelry manufacturing, from CAD to casting in NYC
Guru Diam is a custom jewelry manufacturer for jewelers, retailers and designers. We build custom engagement rings wholesale, three-stone and halo rings, eternity bands, tennis bracelets and stud earrings around certified natural and lab-grown diamonds from our own inventory of 10,000+ IGI and GIA certified diamonds. Every job runs under one roof in the NYC Diamond District on 47th Street, with a second office in the Los Angeles diamond district: a 3D CAD render within 24 hours, then CAD to casting, setting and polishing in 4–6 working days from approved CAD.
No MOQ, paid per piece, in 14K or 18K gold, platinum or silver. Your piece ships under your brand to your client, with a dedicated account manager and a live order portal on every job. More than 3,000 trade accounts work with us.
Verified trade, two coasts, one back room.
36 W 47th St, Ste 601A
New York, NY 10036
607 S Hill St #241
Los Angeles, CA 90014
Jewelry, custom & diamonds: +1 (929) 340-3449
