Business Activities
Leveraging our in-house analytical capabilities and the expertise we have cultivated over half a century, we provide the optimal superabrasives at the best possible prices.
Since its establishment in 1977, Global Diamond Co., Ltd. has been a specialized trading company importing and selling industrial diamonds and CBN (cubic boron nitride) from around the world for nearly half a century.
With a procurement network spanning approximately 15 overseas suppliers and a sales track record with about 150 domestic companies, we maintain a substantial inventory of approximately 3 million carats at all times.
Furthermore, we are distinguished by our in-house state-of-the-art inspection equipment and advanced analytical capabilities.
Drawing from one of the nation’s top-tier product lineups, we propose and supply products best suited to our customers’ applications, contributing to the resolution of manufacturing challenges.
With a procurement network spanning approximately 15 overseas suppliers and a sales track record with about 150 domestic companies, we maintain a substantial inventory of approximately 3 million carats at all times.
Furthermore, we are distinguished by our in-house state-of-the-art inspection equipment and advanced analytical capabilities.
Drawing from one of the nation’s top-tier product lineups, we propose and supply products best suited to our customers’ applications, contributing to the resolution of manufacturing challenges.
Our Strengths
A domestic inventory of approximately 3 million carats at all times and
a stable supply system supported by multiple sources
At Global Diamond, we maintain a stock of over 2 to 3 million carats of diamonds and CBN abrasives at all times, and we have established a system that allows for same-day shipping of in-stock items. Furthermore, in light of the ever-changing global landscape, we have secured multiple procurement channels—including China, Russia, India, and the United Kingdom—to avoid reliance on any single country or manufacturer. This stable supply system is made possible by our network, built over nearly half a century of experience in the sale of industrial diamonds. Leveraging the trust-based relationships we have cultivated with manufacturers over the years, we strive to secure products and offer them at stable prices.
We can help solve these problems▼
- You need fast delivery
- You want to prepare for market volatility /
You’re concerned about supply disruptions
The most extensive product lineup in the country We also accommodate custom orders, including special sizes
We offer a wide range of products designed for various applications and sizes, with a focus on industrial diamond powder and CBN (cubic boron nitride) powder. While mesh sizes are typically supplied according to an international standard sizing system, we can also provide custom sizes to meet specific customer requirements. In addition, we accommodate custom specifications such as high-cut finishes and coating processes.
We can help solve these problems▼
- You want to select the best diamond powder from multiple options
- You are looking for an alternative to address issues with your current abrasive
Incoming and shipping inspections using our in-house testing equipment,
and strict quality control through screening processes
We have actively introduced inspection equipment such as scanning electron microscopes (SEM) and laser diffraction particle size analyzers to establish a comprehensive in-house precision inspection system. We conduct incoming inspections upon receipt from manufacturers and final inspections prior to shipment, ensuring we deliver products of the highest quality under strict quality control. Inspection results are provided as data along with the delivered products.
Furthermore, for customers facing issues with surface scratches or impurities, we can offer an optional secondary processing service to sort and remove coarse particles.
Furthermore, for customers facing issues with surface scratches or impurities, we can offer an optional secondary processing service to sort and remove coarse particles.
We can help solve these problems▼
- Concerned about inconsistencies in abrasive grain quality
- Conducting in-house abrasive grain inspection and grading is time-consuming
Accumulating Data and Expertise
Problem-Solving Capabilities Unique to a Specialized Trading Company
For many years, Global Diamond has operated as a specialized trading company for industrial diamonds and CBN. What sets us apart is not only our ability to import and sell these products, but also our in-house facilities for analyzing and evaluating their quality. We identify characteristics that cannot be determined from catalog specifications alone and propose the optimal products tailored to our customers’ specific applications and equipment.
Another key strength is our extensive expertise in solving our customers’ challenges. Drawing on our accumulated data and track record, we work closely with customers to explore and propose solutions—from selecting the right abrasive grains to suggesting alternative products.
Another key strength is our extensive expertise in solving our customers’ challenges. Drawing on our accumulated data and track record, we work closely with customers to explore and propose solutions—from selecting the right abrasive grains to suggesting alternative products.
We can help solve these challenges▼
- We need consultation on abrasive selection for new product development
- We are looking for a secondary supplier for our current abrasives as part of our business continuity planning (BCP)
Main Services
Import and sale of industrial diamonds and CBN
We offer one of the most comprehensive product lines in Japan, including synthetic diamonds, micron diamonds, CBN, and polycrystalline diamonds. We provide the optimal superabrasive solution tailored to your specific applications and processing needs, whether for polishing, cutting, semiconductor processing, or other purposes.
Contract Analysis and Processing of Abrasive Grains
Leveraging the inspection equipment and analytical expertise we have cultivated as a specialized trading company for superabrasives, we offer contract analysis services for all types of powders. Whether verifying the quality of products purchased from other suppliers or providing a backup when your in-house inspection equipment is out of service, we provide objective analytical data as a third-party organization to complement your quality assurance processes. We also offer contract processing services, including high-cut grinding and various coating applications.
