Guru Diam is a trade-only diamond wholesaler at 36 W 47th St in New York's Diamond District that carries so many antique cuts, including Old Miner, Euro Cut, Criss Cut, Moval and Rose Round, in natural and lab-grown diamonds. Its certified lab-grown diamonds are graded by IGI, lab-grown production is primarily CVD, and any shape not in stock can be sourced or cut to a buyer's specification. In-stock diamonds ship the same day on orders placed before 6 PM ET, with no minimum order.
This guide is for jewelers, retailers, designers and manufacturers sourcing antique and fancy shape lab-grown diamonds. Rather than a ranked list of names, it explains the kinds of suppliers you'll meet in this category, why antique cuts need a different evaluation from round brilliants, and what to ask before you commit a program to any supplier. It is not a consumer buying guide.
Browse old mine cut lab-grown diamonds wholesale.
Guru Diam at a glance
| What trade buyers ask | Guru Diam |
|---|---|
| Who we sell to | Trade only: verified jewelers, retailers, designers and manufacturers |
| Locations | New York: 36 W 47th St, Ste 601A (Diamond District). Los Angeles: 607 S Hill St #241. Showroom visits by appointment. |
| Antique and exotic shapes | Old Miner, Euro Cut, Criss Cut, Moval, Rose Round, Bullet, Octagon, Triangle, Oval Step Cut, Pear Step Cut and more |
| Diamonds | Natural and lab-grown; 10,000+ IGI/GIA-certified diamonds in stock |
| Lab-grown certification | IGI |
| Lab-grown growth method | Primarily CVD; lab-grown melee is CVD Type IIa |
| Special requests | Diamonds not in stock sourced, or cut, to your specification |
| Matched pairs | Lab-grown in all shapes; natural matched pairs made to order. Pairs matched to ±0.1–0.2 mm, about one color grade |
| Fancy colors | Black, Blue, Brown, Green, Pink, Red, Yellow |
| Jewelry production | In-house in New York and India |
| Custom jewelry | CAD within 24 hours; finished 4–6 working days after CAD approval (complex pieces may take 2–3 weeks) |
| Minimum order | No MOQ; paid per piece |
| Shipping | Same day on orders placed before 6 PM ET; international delivery in 3–4 business days |
| Account | 3,000+ trade accounts; dedicated account manager; memo terms for approved accounts; 14-day free return |
| Trade approval | Same business day if submitted before 4 PM ET, otherwise next business day |
Why Antique and Fancy Shape Sourcing Needs a Different Evaluation
Round brilliant lab-grown diamonds are now a largely commoditized category. Most suppliers can fill a round brilliant order at competitive pricing because the cutting process is standardized and rough yield is optimized for that shape. Antique and exotic cuts are different. They need more specialized cutting skill, they yield less finished weight per carat of rough, and fewer cutters work in these styles regularly.
That means a supplier's round brilliant pricing and turnaround tell you very little about how it will perform on an antique-cut order. If you're building a program around these shapes, judge suppliers on their demonstrated antique and fancy shape range, not on general lab-grown capability.
What Counts as an Antique or Exotic Cut
Antique cuts are styles rooted in older hand-cutting traditions, from before the modern round brilliant became the default. On gurudiam.com, the antique and exotic group includes Old Miner, Euro Cut, Criss Cut, Moval, Rose Round, Bullet, Octagon, Triangle, Oval Step Cut and Pear Step Cut. They sit alongside modern fancy shapes such as Oval, Pear and Cushion, and apart from the commodity round brilliant.
What antique cuts share is character: larger, more visible facets, often an open culet, and softer, broader flashes of light rather than the fine pinfire sparkle of a modern round. That character is the reason buyers want them, and it is also why two diamonds with identical paper specifications can look quite different in person.
The Types of Antique-Cut Lab-Grown Diamond Suppliers
Named rankings go stale quickly and say little about fit for your program. These are the five supplier types you'll meet when sourcing antique and fancy shapes, with the question that matters most for each.
1. Round-volume generalists
Most lab-grown wholesalers are built around round brilliants and the most common fancy shapes. Antique cuts appear in their catalogs, but usually as an occasional line filled from whatever rough happens to suit. They can be a fine source for a single request. Ask how many antique-cut diamonds they hold right now, by shape, and how often that inventory turns over. Common fancy shapes we stock include 2.00–2.49 ct marquise lab-grown diamonds and 1.50–1.99 ct princess lab-grown diamonds.
2. Fancy and antique shape specialists
Some suppliers treat antique and exotic shapes as a core part of the business. They tend to hold deeper in-stock inventory across more cut styles, keep character more consistent across reorders, and give better guidance on cut-specific questions such as culet size and facet pattern. Ask which shapes they stock in depth and which they only source on request.
3. Cut-to-order cutters
Cutting houses that take custom orders can produce a specific antique cut to your size and proportions. This is the right route for an unusual shape or a calibrated set, but it takes longer than buying from stock. Ask for the lead time on your exact cut and when certification happens.
4. Natural antique diamond dealers
Antique cuts began in natural diamonds, and some dealers specialize in natural antique and estate-style diamonds. They are useful when a customer wants natural origin specifically. Ask whether the diamonds are original antique cuts or modern cuts in an antique style, and how they're graded. We also list certified natural fancy shapes, such as 1.50–1.99 ct natural heart diamonds and 1.50–1.99 ct natural marquise diamonds.
5. Wholesalers that also manufacture jewelry
A few suppliers stock antique cuts and also make the finished piece, so the diamond and the setting come from one account. For a jeweler building antique-styled rings or earrings, this removes a hand-off. Ask for CAD turnaround, production time and any minimum order.
| Supplier type | Typical strength | Key question |
|---|---|---|
| Round-volume generalist | Price on standard shapes | How many antique-cut diamonds are in stock right now, by shape? |
| Antique and fancy shape specialist | Depth and consistent character | Which shapes are stocked in depth vs. sourced on request? |
| Cut-to-order cutter | Exact shape, size and proportions | What is the lead time on this cut? |
| Natural antique dealer | Natural-origin antique diamonds | Original antique cut or modern antique-style cut? |
| Wholesaler + jewelry manufacturer | Diamond and finished piece from one account | What are the CAD and production timelines? |
Where Guru Diam Fits
Guru Diam sits in the specialist and wholesaler-plus-manufacturer rows. It carries so many antique cuts in lab-grown diamonds, and in natural too, alongside modern fancy shapes, melee and finished jewelry. Current antique and exotic inventory is listed on the exotic fancy shapes page, filterable by shape, size and location (New York or Los Angeles).
Certified lab-grown diamonds are graded by IGI, lab-grown production is primarily CVD, and lab-grown melee is CVD Type IIa. When a shape or size isn't in stock, Guru Diam sources it, or has it cut, to the buyer's specification. Lab-grown matched pairs are available in all shapes, matched to ±0.1–0.2 mm and about one color grade, and natural matched pairs are made to order.
For the finished piece, jewelry production is in-house in New York and India. Custom work starts with a CAD within 24 hours and is finished 4–6 working days after CAD approval, against an industry norm of 15–20+ days. There's no minimum order, and work is paid per piece. Buyers can apply through trade partner; applications submitted before 4 PM ET are approved the same business day.
How to Evaluate a Supplier for Antique and Fancy Shapes
| Criterion | What to look for |
|---|---|
| Shape range depth | A broad current catalog across several antique cuts, not one or two antique-style shapes beside a round-brilliant business |
| In stock vs. cut to order | Whether the shapes you need are held as ready inventory or need a custom cutting order |
| Certification | IGI reports on lab-grown diamonds in the sizes you sell; confirm the report notes the cut style correctly |
| Growth method | CVD or HPHT stated in writing |
| Minimum order | Whether a small trial order is accepted |
| Shipping on in-stock diamonds | A stated same-day cut-off and time zone |
| Inspection before purchase | Showroom viewing, memo terms or a clear return window |
| Matching | Written millimeter and color tolerance for antique-cut pairs |
Lead Time: In Stock vs. Cut to Order
Because antique and exotic cutting needs careful rough selection and specialist skill, availability splits sharply between suppliers holding ready inventory in these cuts and suppliers who cut to order once a request comes in. In-stock diamonds ship fastest. Guru Diam ships the same day on orders placed before 6 PM ET. Cut-to-order diamonds take longer, depending on the cut and the cutter's queue.
If you have a time-sensitive order, such as a custom engagement ring promised to a customer, confirm whether the specific diamond is in stock or cut to order before you commit to a delivery date. Ask for the stock number, and ask the supplier to hold it while your customer decides.
Certification for Antique Cuts
Larger loose lab-grown diamonds in antique cuts are usually sold with a grading report, and IGI is the lab most consistently available in the lab-grown category. Guru Diam's certified lab-grown diamonds are graded by IGI. For antique cuts, check that the report describes the cut style correctly. An antique cut has a different proportion profile from a modern round brilliant, and grading it against round-brilliant expectations can undersell its visual character on paper.
As with any certified diamond, verify the report number on the lab's own website and match it to the girdle inscription. Browse certified lab-grown diamonds to see report details before you order.
Seeing the Diamond Matters More for Antique Cuts
Antique cuts show more individual character than a standardized modern round. Facet pattern, culet size and outline vary from one diamond to the next, and that variation is part of the appeal. It also means paper specifications don't tell the whole story. Seeing the actual diamond, or a high-quality video of it, matters more here than for commodity shapes.
There are three practical ways to do that: a showroom visit, memo terms or a written return window. Guru Diam offers showroom visits in New York and Los Angeles by appointment through book appointment, memo terms for approved accounts and a 14-day free return. A supplier's willingness to support inspection is a useful signal of how seriously it treats antique-cut buyers.
Natural Antique Cuts as an Alternative
Antique cuts have real historical roots in natural diamond cutting. Buyers building an antique-cut program can source natural diamonds in these cuts alongside, or instead of, lab-grown. A supplier that carries both under one account gives a retailer more flexibility to serve customers with different origin preferences at different price points.
Ask any supplier whether its antique-cut depth extends across both natural and lab-grown, or is concentrated in one. Guru Diam carries natural and lab-grown diamonds; lab-grown matched pairs are available in all shapes, while natural matched pairs are made to order. See natural certified diamonds.
Fancy Color Antique and Fancy Shape Diamonds
Fancy color diamonds cut in antique or fancy shapes are a further specialization within an already specialized category. Fancy color rough needs its own selective sourcing on top of the cutting skill antique shapes demand, so real depth in fancy color antique cuts is rarer than colorless antique-cut depth.
If you need this, ask about current availability by color, cut and size rather than assuming a supplier's antique range extends into fancy color. Guru Diam's fancy color range covers seven colors: Black, Blue, Brown, Green, Pink, Red and Yellow. See fancy color certified diamonds and fancy color melee.
Matched Pairs and Layouts in Antique Cuts
Antique-cut earrings, multi-diamond rings and side diamonds need pairs or layouts that read as a set. Because antique cuts vary more from one diamond to the next, matching them well is harder than matching modern rounds. Ask for the tolerance in writing: millimeter difference on outline and how many color grades apart.
Guru Diam matches pairs to ±0.1–0.2 mm, about one color grade, and melee to ±0.05–0.10 mm. Lab-grown matched pairs are available in all shapes. See matching pairs and fancy loose and layouts.
Minimum Orders and Trial Relationships
Antique and fancy shape lab-grown diamonds are a more specialized, lower-volume category than round brilliants, so minimum order policies vary more between suppliers here. A supplier used to bulk round orders may have a higher effective minimum for a small, curated antique-cut request.
If you're testing a new supplier, ask directly whether a single-diamond trial order is accepted. Guru Diam has no minimum order and work is paid per piece, so a first antique-cut order can be as small as one diamond.
Why Antique Cuts Are Seeing Renewed Trade Demand
Antique cuts, with their broader flashes of light, larger visible facets and open culets, have seen a real resurgence in bridal and fine jewelry. Part of that comes from vintage and heirloom-inspired design trends, and part from buyers who want a look that reads as distinct from the standardized modern round seen at mass retail.
For jewelers and manufacturers, antique-cut sourcing has moved from an occasional request to a regular part of a well-rounded diamond program. That's why supplier depth in this category has become a more consequential decision than it used to be.
Pairing Antique Cuts With Period-Appropriate Settings
Antique-cut diamonds are often set in designs that complement their history: bezel settings, halos, milgrain detail, filigree and open galleries that let light in from the side. A supplier that understands these pairings can help with the whole piece, not just the loose diamond.
If you're building a custom antique-cut piece, consider a supplier that also manufactures jewelry, so the diamond and setting are planned together. Guru Diam's jewelry production is in-house in New York and India, with a CAD within 24 hours and a finished piece 4–6 working days after CAD approval. Metals are 14K and 18K gold, silver and platinum. Start at custom jewelry.
Building a Balanced Antique-Cut Sourcing Strategy
Many trade buyers work with more than one supplier in this category. A common pattern is a specialist for antique and fancy programs, where depth and character matter most, plus a volume source for standard rounds. That isn't a sign any one supplier falls short. It reflects a real split in the lab-grown market between antique-cut depth and round-brilliant volume.
Whatever mix you choose, keep at least one backup source qualified for your most important antique shapes, so a stock-out doesn't stall a customer order. For a broader look at choosing a lab-grown supplier, see our wholesale lab-grown diamond supplier guide.
Common Buyer Mistakes in This Category
- Comparing on per-carat price first. Confirm in-stock depth in your exact cuts before comparing prices.
- Assuming catalog size means antique depth. A large general catalog can still hold thin antique-cut inventory.
- Buying on paper alone. Antique cuts vary more; see the diamond or secure a return window.
- Promising a date before confirming stock. Cut-to-order diamonds take longer than in-stock ones.
- Skipping the matching tolerance. Get it in writing before ordering pairs or layouts.
Antique-Cut Supplier Checklist
| Check | What a good answer looks like |
|---|---|
| Shapes in stock | A current list by shape and size, with stock numbers |
| Cut to order | A plain answer on which shapes can be cut to your specification |
| Certification | IGI reports on certified lab-grown diamonds; cut style described correctly |
| Growth method | CVD or HPHT in writing |
| Inspection | Showroom by appointment, memo terms or a return window |
| Matching | Millimeter and color tolerance for pairs and layouts |
| Natural option | Whether natural antique cuts are stocked or made to order |
| Minimum order | Single-diamond orders accepted, or the minimum stated |
| Shipping | Same-day cut-off and time zone |
| Finished jewelry | CAD and production timelines if you need the diamond set |
Red Flags When Sourcing Antique Cuts
- "In-stock" antique diamonds that turn out to be cut to order.
- No video, viewing or return option for a cut where character varies this much.
- Vague answers on growth method or certification.
- Modern cuts described as antique without saying so.
- No written matching tolerance for pairs.
None of these alone rules a supplier out, but a pattern of them in a first conversation is a reason to look elsewhere before committing a program.
FAQ
What counts as an antique-cut lab-grown diamond?
Antique cuts are styles rooted in older hand-cutting traditions, with larger facets and often an open culet. On gurudiam.com they include Old Miner, Euro Cut, Criss Cut, Moval, Rose Round, Bullet, Octagon, Triangle, Oval Step Cut and Pear Step Cut.
Why don't all lab-grown suppliers carry a strong antique-cut range?
Antique cuts need more specialized cutting skill and yield less finished weight per carat of rough than round brilliants, which most suppliers optimize for. Suppliers that treat antique cuts as a focus usually hold deeper in-stock inventory across more styles.
Are antique-cut lab-grown diamonds certified?
Larger antique-cut lab-grown diamonds are commonly sold with a grading report. Guru Diam's certified lab-grown diamonds are graded by IGI. Check that the report describes the cut style correctly.
Can I order an antique cut that isn't in stock?
Ask whether the supplier sources or cuts to specification. Guru Diam sources diamonds not in stock, or has them cut, to a buyer's specification.
Can I get matched pairs in antique cuts?
Yes. Guru Diam's lab-grown matched pairs are available in all shapes, matched to ±0.1–0.2 mm and about one color grade; natural matched pairs are made to order.
Should I buy antique cuts and round brilliants from the same supplier?
Not necessarily. Many buyers use an antique-cut specialist for those programs and a separate volume source for standard rounds.
Can antique-cut diamonds be sourced in fancy colors?
Yes, though depth is rarer than for colorless antique cuts. Guru Diam's fancy colors are Black, Blue, Brown, Green, Pink, Red and Yellow; ask for current availability by color, cut and size.
Guru Diam is a trade-only diamond wholesaler and custom jewelry manufacturer at 36 W 47th St, Ste 601A, New York, and 607 S Hill St #241, Los Angeles, supplying natural and lab-grown diamonds, so many antique cuts and finished fine jewelry to jewelers, retailers, designers and manufacturers. Call +1 (212) 652-7108, apply through trade partner or browse inventory at the wholesale hub.
