Question 1

What is a convex edge on scissors?

Accepted Answer

A convex edge, also called hamaguri or clamshell, is a smoothly curved blade taper used on premium Japanese-style scissors. Instead of a flat angle ground onto the edge, the steel curves continuously from the blade body down to the cutting edge. The result is a sharper, quieter cut that slices cleanly through wet hair without pushing or folding.

Question 2

How much does convex edge sharpening cost?

Accepted Answer

Convex sharpening starts at $85 per pair. The price reflects the dedicated equipment, the longer setup time, and the hand finishing each pair receives. Thinning shears with convex edges are $40. Workshop turnaround is 2-3 business days, and free Express Post return applies on orders over $100, which one convex pair plus thinners hits comfortably.

Question 3

Why does convex sharpening need specialist equipment?

Accepted Answer

Flat honing wheels grind a flat angle onto the edge. Run a convex shear across one and the curved hamaguri profile gets ground away into a cheap bevel, permanently. Once the curve is gone, no amount of subsequent work brings it back. Convex requires curved hones, hand finishing, and a sharpener who knows how to read the existing geometry before touching the blade.

Question 4

How can I tell if my scissors are convex or beveled?

Accepted Answer

Hold the blade up to a light and look at the cutting edge from the side. A beveled edge shows a flat, polished facet at a clear angle. A convex edge shows a smooth continuous curve with no visible flat. Premium Japanese brands at $400 and up are almost always convex. If in doubt, send a photo with your enquiry and we will identify it before any work begins.

Question 5

Which convex scissor brands do you sharpen?

Accepted Answer

All major Japanese convex brands. Mizutani, Kasho, Joewell, Hikari, Yasaka, Ichiro, Hattori, Juntetsu, Kamisori, Matsui, Tondeo, and Jaguar premium lines. Each pair is assessed by hand before sharpening to confirm the existing geometry, then sharpened on equipment matched to that specific edge profile. We have been sharpening convex scissors since 1995.

Convex EdgeSpecialists

What is a Convex Edge?

Convex vs Beveled Edge

Why Most Sharpeners Get It Wrong

Wrong Equipment

Lost Performance

Wasted Investment

How We Preserve Convex Edges

Convex Edge Sharpening FAQs

Trust Your Convex Scissors to Specialists