Osia International supplies loose natural and lab-grown diamonds to approved jewellery retailers, brands and trade buyers. We are wholesale and trade only — we do not sell to the public.
Natural stones are independently certified (GIA, IGI or HRD) and sourced consistent with the Kimberley Process. Lab-grown stones are graded on the same 4Cs scale; for current lab-grown grades and sizes, ask us. Wholesale lab-grown diamonds →
Hong Kong office
- Osia International
- Unit 9D, 8 Hart Avenue, Tsim Sha Tsui, Kowloon, Hong Kong
- (852) 2368-1088
- web@osiaintl.com
Kuala Lumpur and Sydney are our other group offices. All three serve trade clients only. Contact →
What trade clients can source
- Loose certified natural diamonds for your own workshop settings.
- Loose certified lab-grown diamonds; minimum order on request.
- Stones set into Osia private-label, ODM or OEM fine jewellery. Private label manufacturing →
- Live inventory and pricing are visible in the trade portal after your account is approved. This public page does not list prices or stock counts.
How to open a trade account
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Submit the trade application
Tell us about your business. Each application is reviewed by hand. Apply for Access →
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Account approval
Most accounts are usually approved within 7 days.
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Browse and order
Sign in to the trade portal for live loose-diamond inventory, catalogue jewellery and order tools.
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Enquiries before you apply
If you are not ready to apply yet, use the contact form or email web@osiaintl.com with a trade enquiry. Contact →
Registered dealer
Osia International is 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). About Osia →
Apply for a trade account
Approved accounts access live loose-diamond inventory and Osia manufacturing services from one Hong Kong supplier.