Every stone holds its own expression of color and beauty. Our craft is to reveal it.
Sorted and signed by NIRU
01 / Sourcing
01 / Sourcing
NIRU Group sources colored stones responsibly in line with OECD, RJC, and UN Guiding Principles, ensuring ethical procurement, due diligence, risk management, and legal compliance.
OECD-aligned · RJC COP 7
02 / Process
02 / Process
Sorting, preforming, faceting, polishing, color matching, screening, certification. An integrated process, carried out under our strict internal standards.
250 polishers · Seven stages · In-house cutting machines
03 / Tracking
03 / Tracking
Each stone responsibly sourced, barcoded at arrival and tracked throughout the manufacturing process.
Barcode at arrival · File follows the stone · Dual guarantee
Bangkok manufacture
Cutting machines engineered by our team. Sorting and color matching by skilled hands. Naturality screened by our gemmologists. All at our Bangkok facility.
Engineered in-house
Our in-house Precision Engineering Atelier develops proprietary tools and technologies for colored-stone cutting. Through research, engineering, and close collaboration with cutting teams, machines are designed to meet production standards for precision, consistency, and repeatability. This capability supports continuous improvement across the cutting process.
Harmonious perfection
Sorting and color matching performed by our skilled gemmologists, ensuring harmonious selections ranging from perfectly homogeneous sets to refined single- and multi-color gradients.
Naturality
At NIRU, every gemstone entering our stock undergoes an in-house verification procedure known as the Gem Assure Process. This process is carried out by our internal laboratory and includes advanced screening to:
Using state-of-the-art technology and equipment, certified gemmologists screen 100% of stones before they enter NIRU inventory, ensuring confidence, consistency, and integrity at every stage.
The certification process follows strict international standards, combining fundamental gemmological techniques with advanced analytical methods.
Our colored stone collection offers a wide range of varieties, shapes, and selections, all sourced, polished, and controlled within NIRU's process.
Round
Emerald
Cushion
Oval
Pear
Marquise
Baguette
Cabochon
Special
From responsible sourcing to meticulous manufacturing and quality control, every stone is handled under our strict internal standards, ensuring consistency, integrity, and excellence across the entire collection.
Diamonds and naturality.
Open a conversation
One contact for the entire group. Your enquiry will be directed to the right team.
