About Us


We are a fine jewellery manufacturing and diamond trading company based in Hong Kong since 1992 with our jewellery production done in China and Hong Kong. Our products are manufactured under strict quality control standards using the latest technologies available in the market and are exported to all major countries around the world. We have a wide range of clientele ranging from chain stores to designer boutique shops.


Our jewellery is manufactured under strict supervision where the quality and craftsmanship of the jewellery is never compromised.

We specialize in diamond and colorstone jewellery with styles ranging from classic to modern European designs.

Osia offers a large selection of fine quality jewellery at competitive prices which includes rings,pendants, earrings, necklaces, bracelets, bangles, brooches and complete sets.



·         Bridal Jewellery - Semi mounting rings, engagement rings, wedding bands, couple rings.etc

·         Diamond & Colorstone Jewellery - Diamond and colorstone jewellery which includes colorstones such as ruby, sapphire, emeralds, amethyst, period, garnet, multi color sapphires, tourmaline, topaz, opal, jade, coral, red coral, turquoise, onxy.etc

·         Solitaire Diamond Jewellery -  Designer Inspired Solitaire Diamond Jewellery ranging from 0.20cts till 10 carat in size.

·         Statement and Fashion Jewellery -  Collection consisting of micro pave diamonds rings, designer earrings, art-deco style and modern design bracelets, designer diamond encrusted pendants.etc.

·         One Of a Kind Piece - Unique one of a kind diamond and colorstone jewellery

·         Men Jewellery - Diamond and Colorstone Mens Jewellery.

We manufacture products in various metal contents such as palladium, gold and platinum. Metal contents are listed below for your reference:

·         9K White / Yellow Gold

·         14K White / Yellow / Rose Gold

·         18 K White / Yellow / Rose Gold

·         20K White / Yellow / Rose Gold

·         22K White / Yellow / Rose Gold


·         PT 900

·         PT 950



We deal in certified and non certified diamonds ranging from 0.30 carats to 10 carats in sizes. Our product ranges from IF to I1 clarity , D to O color, in round and all fancy shape diamonds. We specialize in GIA/IGI/HRD certified diamonds.