Vertically Integrated ODM
Design managed end-to-end, priced straight off the line.
Osia International is a vertically integrated manufacturer supplying wholesale buyers, global brands, and retail chains with precision-cast jewellery and certified diamonds at factory-floor pricing.
Discover More →jewellery items in stock
certified diamonds
group offices
Inventory synced 5 Sep 2026, 1:45pm
The Vault
Three inventories, no markup stacked in between.
Manufactured to Specification
Jewellery Products
Precision-cast fine jewellery in 925 silver, 10k to 24k gold, and platinum. Full production traceability on every SKU.
Browse Products → IIIndependently Graded
Natural Diamonds
Independently graded natural stones. Every shape, carat, colour, and clarity, sourced direct.
Search Natural → IIICertified 4Cs Standard
Lab-Grown Diamonds
Certified to the identical 4Cs standard as natural. A growing share of trade demand, sourced directly.
Search Lab-Grown →Factory-Direct Margin
Factory pricing, without the supplier chain in between.
As a vertically integrated ODM, Osia controls design, casting, and setting in-house, passing the margin a traditional distributor would take straight back to your cost basis.
"No middleman markup between our production network and your account. What you're quoted is what it actually costs to cast and set the piece."
Stock and diamond feeds update continuously, so what you see in the catalogue is what's actually available, not a snapshot from last week's inventory count.
Hong Kong, Kuala Lumpur, and Sydney run as one supply chain, not three separate relationships to manage.
Journal
What we've been making.
Inside the Casting Floor
A look at how a design moves from CAD file to finished, hand-set piece.
Read More → SourcingResponsible Sourcing, Traced End to End
Kimberley Process compliance on every natural stone, full production traceability on every piece we make.
Read More → ProductsSourcing Natural & Lab-Grown Diamonds
Certified stones, sourced direct, both natural and lab-grown, side by side.
Read More →
Frequently Asked
Common questions from trade buyers.
What does Osia International do?
Osia International is a Hong Kong-based ODM (Original Design Manufacturer) jewellery producer and diamond trader, founded in 1992. We design and manufacture jewellery in-house, and source certified natural diamonds, natural gemstones, and lab-grown diamonds directly for wholesale buyers, global brands, and retail chains, skipping the supplier layer a traditional wholesaler adds.
Who can buy from Osia?
Osia sells wholesale only, to approved trade accounts: retail chains, jewellery brands, and independent boutiques. Apply for trade access to see live inventory and pricing - there is no public storefront.
What does Osia sell?
Three catalogues on one account: precision-cast fine jewellery in 925 silver through 22k gold and platinum, independently graded natural diamonds, and lab-grown diamonds certified to the identical 4Cs standard.
Where is Osia based?
Headquartered in Hong Kong since 1992, with group offices in Kuala Lumpur, Malaysia and Sydney, Australia, alongside production across Hong Kong and mainland China.