Superior Gems · For the trade
From rough to ready.
Natural, lab-grown and melee diamonds at wholesale prices, from a collection of over 400,000 stones.
- Scan: know every angle.
- Plan: plan the cut.
- Saw: cut to the plan.
- Match: matched to spec.
- Ready: ready for your bench.
Scroll to follow one stone
01 / Scan
Know every angle.
Shape, weight, and inclusions mapped before the first cut.
02 / Plan
Plan the cut.
Choose the cut that keeps the most weight.
03 / Saw
Cut to the plan.
A laser follows the planned line and splits the rough.
04 / Match
Matched to spec.
Each polished stone is weighed, graded and checked against the plan.
05 / Ready
Ready for your bench.
Natural. Lab-grown. Melee.
Graded and traded under
Natural rough
Reports and frameworks our stones are listed under. Names belong to their owners; no endorsement implied.
Single stones, matched pairs and parcels.
The paperwork
Check every report yourself.
Natural and lab-grown stones are listed separately. Each certified stone shows the lab that graded it and its report number.
- 400,000+
natural and melee diamonds in our inventory
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Three labs, checked on their own sites
Look up any report number on the lab's own website before you pay.
About each lab
Lab · natural and lab-grown GIA. The Gemological Institute of America. Independent nonprofit lab, founded 1931. Natural diamond reports give the 4Cs. From 1 October 2025 GIA lab-grown assessments are Premium or Standard rather than colour and clarity grades; earlier lab-grown reports remain valid.
Lab · natural and lab-grown IGI. The International Gemological Institute. Founded in Antwerp in 1975. Reports for natural and laboratory-grown diamonds; lab-grown stones are inscribed with an LG prefix and the report number.
Lab · natural HRD Antwerp. Antwerp grading laboratory. Reports confirm whether a stone is natural, laboratory-grown or treated, and cover carat, colour, clarity and cut.
- 3
grading labs: GIA · HRD · IGI
- 5
countries with a Superior Gems office
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Natural origin
Kimberley Process and System of Warranties
Natural rough diamonds cross borders with a government-issued Kimberley Process certificate.
Read more
Polished stones don't carry one, so the trade uses the World Diamond Council System of Warranties: a written statement on every business invoice that the diamonds come from legitimate sources not involved in funding conflict.
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Origin disclosure
Natural or lab-grown, always stated
Natural and laboratory-grown stones are listed, stored and invoiced separately.
Read more
Every laboratory-grown stone says so, next to the word diamond.
Lab descriptions are the labs' own. We supply reports as issued. Melee and cut-to-spec stones are graded in-house and sold without a lab report; they are labelled that way.
The journey Scan, plan, saw, match, ready. Follow one stone from rough to finished in the scroll above. Back to the journey.
Explore diamonds
A diverse diamond collection.
Search by origin, shape, size or grade. One trade account covers all of it.
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Certified natural stones.
Certified natural diamonds, with GIA, HRD and IGI reports.
Explore natural -
Lab-grown, always labelled.
CVD and HPHT diamonds, clearly identified as laboratory-grown.
Explore lab-grown -
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Cut to your spec.
Grade your own stones? Skip the certificate. We make loose diamonds to your requirements.
Explore custom cuts -
Jewellery. Coming soon.
Engagement rings, earrings and bracelets, set with our stones.
Join the launch list Coming soon
Browse by shape
10 shapes
Trade access in three simple steps
Free access to our restricted prices and stock list, updated regularly. Registration is quick and done only once.
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Sign up
Register your business once to get wholesale pricing. We check every business before giving access.
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Browse 400,000+ diamonds
Natural stones with GIA, IGI or HRD reports, and melee parcels graded in-house.
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Place your order
Pick your stone, hold it for 24 hours if you need to, and order. We handle the rest.
Why the trade buys from us
Graded by the lab, or cut to your spec.
Superior Gems is a diamond wholesaler with offices in Australia, India, the USA, Canada and Hong Kong. We hand-select natural and lab-grown diamonds from around the world. Certified stones carry a GIA, IGI or HRD report you can check with the lab yourself. Most of our buyers grade their own stones, so we also make loose diamonds to their requirements, without the cost of a certificate. Natural stones are sourced in line with the Kimberley Process and the System of Warranties, and natural and lab-grown are kept apart.
Every certified stone is verifiable.
Check any report on the lab's own site in three steps.
- 01
Find the report number
It is on the report, and laser-inscribed on the stone's girdle (seen under 10x magnification).
- 02
Check it on the lab's site
Enter the number on the lab's own page, not ours.
- 03
Match it to the stone
Shape, carat weight and grades should match the stone's listing, and the girdle inscription should match the number. If anything differs, stop and call us.
An online lookup shows the report is genuine and unaltered in the lab's records. It does not prove the stone in your hand is the one it describes; only the girdle inscription does that.
Melee and cut-to-spec stones are graded in-house and come without a lab report.
Full guide: verify a certificateQuestions before you buy
The short version. Full detail in How to buy.
Who can register?
Registered jewellery and diamond businesses. We verify each business before approval, as dealers in high-value goods should.
How do holds work?
Approved buyers can hold any available stone for 24 hours. A held stone is reserved for you and hidden from other buyers until the hold ends or you order it.
How do I pay?
Unless we agree credit terms in writing, orders are paid in full before dispatch. We never change bank details by email: call our Sydney office on +61 410 058 909 if asked to pay a new account. We accept international wire transfer, and local transfer in Australia and Canada.
How are stones shipped?
Insured, with a secure carrier. Customs duties and import taxes in your country are paid by the buyer unless we agree otherwise. We ship with FedEx or Malca-Amit.
Can I return a stone?
A stone can be returned only if its listing shows it as returnable: within 7 days of delivery, unset, in the same condition and with its certificate. Melee parcels and cut-to-spec stones can't be returned unless faulty or not as described. See How to buy.
How do I verify a certificate?
Every certified stone carries its lab and report number. Check it on the lab's own website: verify a certificate.
Not listed? Ask us
Call our Sydney office: +61 410 058 909
Enquire now
Ask about a stone, or apply for trade prices.
Tell us the stone, parcel or spec you need and we reply by email. Approved trade buyers see live stock and their prices online.
Our offices around the world
India
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USA
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Canada
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Hong Kong
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