About us

About us

“OIA Diamond” is located in Zhengzhou City China.


The city has been hailed as the “center of the world’s artificial diamonds” since the 1990s.

20 years ago, our company could only produce rough diamond powder for the manufacture of grinding wheels, sandpaper and other common industrial products.  

Our factory (1)
Our factory (2)
Our factory (3)

However, we have never stopped the pace of technological innovation.


After years of hard work, we have made breakthrough progress in the field of HPHT and CVD diamond cultivation, making high-quality gem-grade type – II A rough diamond possible.


Today, we have hundreds of advanced production equipment, excellent R & D team, our diamonds are cheaper, bigger carat, sufficient inventory, and rapid delivery.

Diamond factory (20)
HPHT Diamond factory (12)

We decided to create the “OIA Diamond” brand, we hope to provide more economical, environmentally friendly, conflict-free Diamonds to the world.

Why Choose Us

HPHT rough diamonds









Buy Directly From Factory No Middleman.  


                         Price more lower








First-class production equipment and raw materials


                       For the perfect diamond

HPHT Diamond production (3)






Sufficient Stock of various shapes, Carat, Clarity.


               Delivery within 48 ~ 72 hours.

Our Philosophy: Customer First Service Foremost