1. Adamas One Corp.
2. Anhui Hongjing New Material Co. Ltd.
3. Applied Diamond Inc
4. Besco Superabrasives Co.Ltd.
5. Compagnie de Saint-Gobain S.A.
6. De Beers Group
7. Element Six (UK) Limited
8. Funik Ultrahard Material Co. Ltd.
9. H.C. Starck Tungsten GmbH
10. Henan Huanghe Whirlwind CO.Ltd.
11. Henan Yalong Superhard Materials Co. Ltd
12. Hyperion Materials & Technologies Inc.
13. ILJIN Diamond Co. Ltd.
14. Kennametal Inc.
15. Morgan Advanced Materials plc
16. Mudanjiang Jingangzuan Boron Carbide Co. Ltd
17. Sandvik AB
18. Scio Diamond Technology Corporation
19. SF Diamond Co. Ltd.
20. Sumitomo Electric Industries
Ltd.
21. Tomei Diamond Co.Ltd.
22. WorldWide Superabrasives
LLC.
23. Zhengzhou Sino-Crystal Diamond Co. Ltd.
24. Zhongnan Diamond Co. Ltd.