Welcome To Osia Gems
The round brilliant cut diamond is by far the most popular and most researched diamond shape available today.
Discover the secrets of round cutting and polishing in our diamond cutting factory.
Admire our impressive round cutting diamond collection.
A brilliant experience which you will not forget in a hurry.
Osia gems has been Diamantaire Since 1970. We offer the widest range of polished diamonds at manufacturing price as we are manufacturers of diamonds ourselves.
Why buy from Osia Gems?
You want something unique and handmade just for you.
You want a custom personalized service tailored to your requirements.
You want exceptional diamonds handpicked to maximize fire and brilliance.
We specialize in manufacturing Round Cut Diamonds starting from 0.01 cts to 0.15 cts in all colors like WHITE, LB,, DB, TTLB, TTLC and also treated black diamonds up to 20 carats in size.
4' CS of Diamonds Gradation
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