Osia International supplies certified lab-grown diamonds to approved jewellery retailers and brands, alongside our ODM fine jewellery manufacturing.
Lab-grown stones are graded on the same 4Cs scale as natural diamonds. Every diamond we supply is independently certified by GIA, IGI or HRD. Osia is wholesale only — we do not sell to the public.
Osia has been a Hong Kong ODM fine jewellery manufacturer and diamond wholesaler since 1992, with offices in Hong Kong, Kuala Lumpur and Sydney. About Osia →
What you can source
- Certified lab-grown diamonds, graded on the same 4Cs scale as natural stones.
- Osia does not publish shape, grade or size bands on this page. For current lab-grown availability, ask us or send a trade enquiry. Contact →
- Stones for use in Osia private-label, ODM or OEM jewellery. Clients can use Osia's certified natural and lab-grown diamond inventory in private-label production. Private label manufacturing →
- Approved trade accounts may buy loose lab-grown diamonds for their own workshop settings. Minimum order for loose stones is on request.
- Certified natural diamonds remain available. Natural stones are sourced consistent with the Kimberley Process.
Inventory and qualified trade accounts access live stock through the trade portal after sign-in. This public page does not list prices or stock counts. Apply for Access →
How trade accounts buy
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Apply for a trade account
Most accounts are approved within a few business days. Apply →
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Browse inventory
Use the trade portal after sign-in.
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Order loose stones and/or finished jewellery
Finished pieces are produced with our partner workshops and factories. Every finished piece is checked at factory level and again by Osia before dispatch, including diamond testing in Osia's in-house quality control. Manufacturing → · ODM vs OEM →
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Delivery
In-stock catalogue orders typically ship in 3–7 business days. Shipments go by DHL Express or FedEx, insured for full declared value. Shipping →
Osia designs every piece, specifies it and manages production end-to-end. Casting is done in our partner production factories, and stone setting is done either locally in Hong Kong or at our partner workshops and factories, depending on the job. We do not claim to own the factory.
Why retailers use Osia for lab-grown
- One accountable Hong Kong ODM manufacturer since 1992, with offices in Hong Kong, Kuala Lumpur and Sydney.
- Design, specification and quality control stay with Osia; production runs through close partner workshops and factories, with in-house QC and testing equipment.
- Registered with the Hong Kong Customs and Excise Department as a Dealer in Precious Metals and Stones, registration A-B-24-01-04540 (Category A).
- Trade only — we do not operate a consumer storefront, so retail clients are not competing with their supplier on a public shop.
FAQ
Do you sell lab-grown diamonds wholesale?
Yes, to approved trade accounts only. Osia does not sell to the public.
Are the stones certified?
Yes. Diamonds Osia supplies are independently certified by GIA, IGI or HRD.
Is there a minimum order?
There is no minimum order for custom and private-label jewellery work. For loose lab-grown stones, minimum order is on request.
Can trade accounts buy loose lab-grown diamonds?
Yes. Approved trade accounts may buy loose lab-grown diamonds for their own workshop settings. Minimum order is on request.
Can lab-grown stones go into a private-label line?
Yes. Clients can use Osia's certified lab-grown inventory in private-label production.
Do you sell to the public?
No. Osia is wholesale and trade only.
Do you own the factory?
Osia runs production through close, long-term partner workshops and factories. Design, specification and quality control stay with Osia, including in-house QC and diamond testing before dispatch. You deal with one accountable manufacturer, not a broker.
How to start
Apply for a trade account, then speak to your account contact about lab-grown stones or a private-label line that uses them.