Monocrystalline vs. Polycrystalline Diamond for Metallographic Polishing

Written by: Dr. Mike Keeble
Last Updated: August 2026
No Comments
Reviewed by: Buehler Lab Team

Choosing Diamond Suspension

Diamond is routinely used for the preparation of most materials due to its high removal rate and low deformation depth. They are available in a wide range of micron sizes and two main diamond types. The micron size needed is determined by the material and end analysis goals.

Diamond types (Monocrystalline vs Polycrystalline)

Material removal rate directly impacts the speed of each process step. A higher removal rate means moving on to the next step more quickly, allowing faster analysis and increasing throughput. Because of its multi-faceted shape, polycrystalline diamond removes material faster and produces less deformation than monocrystalline for ductile materials. The fewer facets on monocrystalline diamond make it best suited for preparing very hard materials such as ceramics. Always look for diamond suspension developed with strict quality control for particle size and shape to get a reproducible finish.

MetaDi | Monocrystalline

Cost effective
Sharp, blocky particles
Best for ceramics

MetaDi | Polycrystalline

Faster preparation times
Reduced deformation
Only small amount needed for high quality polish

Monocrystalline vs. Polycrystalline Diamond for Metallographic Polishing FAQs

What is the difference between Monocrystalline and Polycrystalline Diamond Suspensions?

Material removal rate directly impacts the speed of each step. A higher removal rate means moving on to the next step more quickly, allowing faster analysis and increasing throughput.

Because of its mutli-faceted shape, polycrystalline diamond removes materials faster and produces less deformation that monocrystalline.