Loose stone supply
Loose Lab Grown Diamond Stones, Calibrated by Shape
Loose lab grown diamonds at wholesale: CVD and HPHT, 0.01 ct to 5 ct and beyond, D to J colour, VVS to SI clarity, IGI graded with inscriptions and stone-to-certificate match sheets.
- 0 products in this collection
- MOQ from 20 pcs
- Worldwide insured shipping
- Certified stones on request
No products found.
Buying loose lab grown diamonds by specification, not by photograph
A lab grown diamond is a specification purchase. Once you fix carat, shape, colour and clarity, the remaining variables are cut quality, fluorescence and certificate, and those three decide whether the stone is worth its price. Buyers who order from a photograph alone are routinely disappointed by cut quality, because a photograph cannot show facet symmetry or light return.
The specification fields that matter
| Field | Typical range we supply | Notes |
|---|---|---|
| Carat | 0.01 ct melee to 5 ct and above | Above 3 ct, buy to order rather than holding stock |
| Shape | Round, oval, cushion, pear, marquise, radiant, emerald, princess, heart | Round and oval are the volume shapes |
| Colour | D to J; D to F premium, G to H mainstream, I to J value | Colour has the strongest effect on price above 1 ct |
| Clarity | VVS1 to SI2; VS1 to VS2 for retail consistency | VVS is a premium, VS is the volume retail grade |
| Cut grade | Excellent or Very Good where graded | Do not accept an ungraded cut above 1 ct |
| Fluorescence | None to faint preferred | Strong fluorescence can make a stone look milky |
| Growth method | CVD or HPHT, stated explicitly | Never accept a mixed-method parcel quoted as one grade |
| Treatment | Disclosed where applied | Some CVD stones are annealed for colour; require disclosure |
| Certification | IGI, GIA or NGTC above 0.30 ct | Report number inscribed on the girdle |
Melee parcels
Below about 0.30 ct, individual certification is not economic, so melee is supplied as calibrated parcels with a grading sheet: size range, for example 1.20 to 1.30 mm sorted to 0.05 mm, piece count, total carat weight, colour band and clarity band. Melee is the highest-volume lab grown diamond product in our range and the one where tolerance consistency matters most, because setting frames are cut to the parcel.
Certification and traceability
- IGI and GIA reports are available above 0.30 ct, with the report number laser-inscribed on the girdle so the physical stone can be verified against the paper.
- NGTC is available for buyers who need a Chinese-market report.
- A stone-to-certificate match sheet accompanies every order above 0.30 ct: SKU, carat, colour, clarity, report number and measured weight, line by line.
- A material declaration stating laboratory-grown origin accompanies every export shipment, which is what customs authorities require.
- We state the growth method and any post-growth treatment on the specification sheet. We do not mix methods in a parcel quoted as a single specification.
MOQ and pricing
| Product | MOQ | Certification |
|---|---|---|
| Melee parcels under 0.30 ct | Parcel basis, no piece minimum | Parcel grading sheet |
| Singles 0.30 to 0.99 ct | 20 pcs per size and grade | IGI or GRA on request, quoted separately |
| Singles 1.00 ct and above | 5 pcs per specification | IGI or GIA recommended |
| Large stones above 3 ct | 1 pc, made to order | IGI or GIA, required for resale |
Quality control
- Every stone measured with a caliper and weighed on a calibrated scale, with measurements recorded against the specification.
- Colour graded against master stones under controlled daylight, with a one-grade tolerance stated on the approval sheet.
- Clarity assessed at 10x by a trained grader, and inclusions on the girdle or near a future prong position are flagged.
- Cut symmetry and polish inspected for facet alignment and light return, particularly on emerald and princess cuts where misalignment is most visible.
- Certificate inscription verified against the physical stone before packing, and the match sheet signed off by the person who verified it.
Questions about Loose Lab Grown Diamond Stones, Calibrated by Shape
Should I buy CVD or HPHT?
It depends on your specification. CVD scales well at larger sizes and typically produces D to G colour, sometimes requiring post-growth annealing for colour, which must be disclosed. HPHT is well suited to melee and mid sizes and often produces near-colourless stones without treatment. Both are chemically identical diamond. The commercial point is that you should know which you are buying, because colour and clarity distributions differ and price differs at the same nominal grade. We state the method on every specification sheet.
Can you supply melee with a specific size range?
Yes. Melee is supplied as calibrated parcels sorted to 0.05 mm, with the parcel sheet stating the actual measured range rather than a nominal size, for example 1.20 to 1.30 mm, 1,000 pieces, 12.45 ct total, D to F colour, VVS to VS clarity. If you are cutting a setting frame to a specific dimension, give us that dimension and we will sort the parcel to match it, which avoids rework at your bench.
How do I verify a certificate matches the stone?
Three checks. First, read the laser inscription on the girdle with a 10x loupe and compare it to the report number. Second, measure the stone with a caliper and compare the dimensions to those printed on the report, which should match within 0.02 mm. Third, compare the stone weight to the report weight on a calibrated scale. We do all three before dispatch and sign off a match sheet, which accompanies the order so you can repeat the checks on arrival.
What is the MOQ for loose lab grown diamonds?
Melee parcels are sold on a parcel basis with no piece minimum. Certified singles from 0.30 ct to 0.99 ct start at 20 pieces per size and grade combination. Stones of 1.00 ct and above start at 5 pieces per specification, and stones above 3 ct are made to order from one piece. Above 3 ct we recommend buying to order rather than holding stock, because prices in the large-stone segment continue to soften.