KOI Began designing and building diamond knives in 1980. Since then, we have manufactures and repaired over 100,000 diamond knives. We have built our reputation on delivering the finest quality products at affordable prices. We are completely an in-house manufacturing and repair facility.

Each DGH-KOI knife is manufactured to precise specifications. Our 28 step quality assurance check guarantee excellence.

At DGH-KOI, we take pride in providing the most comprehensive warranty in the industry.