About Rayonu

Rayonu is China’s leading vertically integrated lab-grown diamond innovator, specializing in cultivation, precision cutting, and luxury jewelry design. Backed by a team of over 4,000 professionals and cutting-edge technology, we ethically craft sustainable diamonds that match the brilliance and quality of natural stones—without the environmental or social cost.
From atom to adornment, every Rayonu diamond is born with integrity, precision, and purpose.

We operate two main facilities in China:
📍 No. 6 Changchun Road, Zhongyuan District, Zhengzhou, Henan Province — Responsible for diamond production base
📍 No. 23 Tianshan 3rd Road, Jimo District, Qingdao, Shandong Province — Responsible for setting and export
Lab Production

Advanced HPHT technology replicates Earth’s diamond-forming conditions, producing high-purity, D-to-F color diamonds under ISO-certified eco-friendly processes.
Expert Screening

Master gemologists and advanced tools enforce rigorous 4C grading, with dual verification ensuring <5% defect rate and flawless clarity.
Laser Cutting

India-engineered laser systems achieve 5-micron precision, optimizing rough diamond utilization by 30% and accelerating shaping efficiency.
Hand Polishing

Veteran artisans (20+ years’ experience) employ Antwerp’s 57-facet cut techniques, delivering ideal light refraction and GIA/IGI-certified symmetry.
Jewelry Crafting

Collaborations with Red Dot Design Award-winning teams create heirloom pieces using conflict-free 18K gold/platinum and hypoallergenic settings.