Pro-400 Vitrified Diamond Stone Review By DiamondCutSteel

This is a review of the Cheefarcuut 400 grit vitrified diamond sharpening stone, using a real-world session sharpening a well-used Spyderco Para 3 in CPM S110V as the example. The focus is on how the stone cuts, how it feels in use, and whether it makes sense if you regularly work with high-wear steels like S110V.

Test setup

The knife used in this review is a Spyderco Para 3 in CPM S110V, a steel known for its excellent edge retention but also for being slow and stubborn to sharpen on conventional stones.

Sharpening is done freehand on the Cheefarcuut 400 grit vitrified diamond stone, without jigs or guides, to show how the stone behaves in a realistic, everyday scenario rather than in a controlled lab setup.

Cutting speed and steel removal

On CPM S110V, the Cheefarcuut 400 grit stone removes metal surprisingly quickly for such a hard, wear-resistant steel. It forms a fresh apex without feeling painfully slow or like you’re just skating on the surface.

Old, fatigued steel at the edge comes off in a controlled, predictable way instead of glazing, smearing, or causing the stone to skid. That’s a common issue with softer or less aggressive stones on steels like S110V, and it’s where this vitrified diamond stone clearly stands out.

Feel and feedback

For a vitrified diamond stone, the tactile feedback is quite clear. You can feel when the edge is properly registered on the surface and when you’re making contact right at the apex.

During the sharpening session, the stone does not load up badly, so there’s no constant need to stop, scrub the surface, and restore its cutting power. It maintains a steady, consistent feel from start to finish, which makes it easier to stay in control of your angle and pressure.

Edge quality

The 400 grit finish from this stone produces an aggressive, toothy edge that’s ideal for everyday cutting tasks such as cardboard, rope, and general utility work.

It’s not intended to be a polishing stone, but it does create a consistent, functional working edge that bites into material rather than sliding across it. If you prefer a more refined or mirror-polished edge, this stone works well as the first step before moving to higher grits.

Pros and cons

Pros

• Fast cutting on high-wear, high-carbide steels like CPM S110V
• Clear feedback for a vitrified diamond stone, making freehand work easier
• Minimal loading during use, with stable cutting performance across the session

Cons

• At 400 grit, it is strictly a coarse to mid-coarse stone
• Users who want a fine, polished edge will still need to add higher-grit stones to their progression

Verdict

For users who frequently sharpen modern, high-wear steels such as CPM S110V and want a coarse stone that actually removes metal instead of fighting the steel, the Cheefarcuut 400 grit vitrified diamond stone is a strong, practical choice.

It excels as a first stone in a sharpening progression or as a dedicated “work edge” stone for tough, high-carbide blades where a toothy, high-grip edge is exactly what you want.