A diamond sharpener uses industrial diamonds as the abrasive material. Diamonds remove steel faster than traditional sharpening stones while maintaining a flat sharpening surface over time. This makes them particularly suitable for modern knife steels, tools, and precision sharpening applications.

For most users, we recommend 300/600 grit. The coarser side shapes the edge, while the finer side removes the burr and leaves a sharp, durable edge.

600/1200 grit is suitable for finer maintenance, kitchen knives, and other tools where a more refined and polished edge is desired.

Some specialized sharpeners are also available with coarser grits for rapid material removal.

The right choice depends primarily on what you want to sharpen and how the sharpener will be used.

For kitchen knives, we recommend diamond sharpeners designed for precision and control. For outdoor use, compact sharpeners offer low weight and portability. In the workshop, larger sharpeners provide efficient material removal and stable support for tools and edged tools. For sports equipment, specialized sharpeners are available for skis, skates, and pole tips.

If you're unsure, start by choosing the category that best matches your intended use.

Mini – pocket-sized for EDC, hunting, and outdoor use.

Short – compact format with a generous sharpening surface.

Long – the all-round choice with extended reach and versatility.

Cook – designed for kitchen knives and longer sharpening strokes.

All sizes use the same diamond surface and provide the same sharpening performance. The main differences are working area, handling, and intended use.

No. Dianova diamond sharpeners can be used dry, making them convenient to use anywhere.

Water can be used to rinse away swarf and sharpening debris, but it is not required. Oil is not recommended.

For best performance, rinse the sharpener after use when possible and clean it occasionally with warm water and dish soap.

The most common cause of reduced performance is a clogged surface, not worn-out diamonds.

Rinse the sharpener after use whenever possible. If needed, clean it by hand with warm water, dish soap, and a soft brush.

The most common cause of reduced sharpening performance is a surface clogged with steel particles and sharpening debris, not worn-out diamonds.

With normal use, a diamond sharpener will last for many years.

Diamonds remove steel efficiently with light pressure, which helps minimize wear. Our diamond plates have been used professionally since 1993 and are designed for long service life.

In most cases, reduced performance is caused by a clogged surface rather than worn-out diamonds. Regular cleaning helps maintain fast cutting action and consistent results.

Yes.

Diamond sharpeners work exceptionally well for scissors, pruning shears, axes, chisels, and other edged tools.

The flat diamond surface makes it easy to follow the original bevel and maintain the correct sharpening angle.

You can also find detailed sharpening guides for scissors, pruning shears, and other tools in our guide library.

All Dianova diamond sharpeners are developed and manufactured in Sweden.

Since 1993, we have specialized in diamond-based sharpening tools for kitchens, workshops, outdoor use, and winter sports.

We manufacture the diamond plates used in our sharpeners ourselves, allowing us to maintain consistent quality, performance, and durability.

We have collected sharpening guides for kitchen knives, scissors, pruning shears, sports equipment, and other tools in our guide library.

Whether you're new to sharpening or looking to refine your technique, you'll find practical advice, step-by-step instructions, and product-specific tips to help you get the best results.

Browse all guides in our Guide Library.