How can these be sharpened? Would diamond impregnated stone work? Or are they too brittle to ever sharpen?

Ceramic knives can be sharpened but it requires an expensive machine or a lot of time. The blades are pretty close to the same hardness rating of industrial diamonds so you would need a lot of passes/friction with a stone to remove any measurable material to form an edge. Your better bet is to buy a few extra set of these knives for the price of the sharpening service or machine. I have seen a few sharpening machines (manual is laborious and dangerous) advertised to sharpen ceramic but have not tried them since it was cheaper and safer to buy another set.

What is the length of the blades?

Dear Shopper, I can't remember the length of the blades, except that the longest blade was not all that long, certainly not as long as some of the butcher knives in my kitchen drawers. I suspect that ceramic knives with long blades are too easily broken to be practical. However, the knives were good quality and I was pleased with the purchase, as was my sister for whom they were purchased.

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Rosewill RHKN-13002 5-Piece Ceramic Knife and Cutting Board Set - Black Handle

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Rock-hard blade with excellent sharpness retention
Lightweight and ergonomic handle
Hand wash only

Overview

Specs

Reviews (17)

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Your kitchen tasks couldn't be easier with the Rosewill RHKN-13002 five-piece ceramic knife and cutting board set. The knife's ceramic blade is sharper and lasts longer compared to traditional steel blades, giving you a new experience in cutting, slicing, and peeling. Made of an eco-friendly material, the ceramic blade resists acid, germs, oil, and rust, and will not affect the taste of food. A cutting board is included for out-of-the-box use.

Ceramic BladesThe blade is constructed with zirconia, which is sharper and harder for more cutting power, and can hold an edge longer.
Ergonomic HandleWith its lightweight, ergonomic handle, this knife is great for precision cutting and thin slicing.

General
Brand	Rosewill
Name	5-Piece Ceramic Knife and Cutting Board Set - Black Handle
Model	RHKN-13002
Type	Cutlery Sets

Feature
Features	Ceramic Blades are Sharper and Last Longer. Hard than Steel and will hold an edge longer Resistant to Acids, Germs, and Oils and will not Rust Will not affect the taste of food Comfortable and easy to use for Precision slicing Note: 1. Do not use knife on stone chopping block 2. Do not use to chop or pry as this may chip the tip of knife 3. Blade is very sharp. Please keep it away from children 4. Do not sharpen the blade with traditional sharpener 5. Wash the knife with mild detergent
Set Includes	Ceramic Knife Set 1pc 6" Santoku 1pc 5" Utility Knife 1pc 3" Paring Knife 1pc Peeler 1pc Cutting Board 3pc Sheath

Spec
Material	Blade: Zirconia Handle: ABS + TPR Sheath: PP Cutting Board: PP
Quantity	5-Piece
Handle	ABS + TPR

Dimensions & Weight
Height	1.50"
Width	12.90"
Depth	11.90"
Weight	1.35 lbs.

Additional Information
First Listed on Newegg	October 02, 2013

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return Policies

Return for refund within: 30 days

Return for replacement within: 30 days

This item is covered by Newegg.com's 30-Day Return Policy.
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Rosewill RHKN-13002 5-Piece Ceramic Knife and Cutting Board Set - Black Handle

Learn more about the 5-Piece Ceramic Knife and Cutting Board Set - Black Handle

Customer Reviews of 5-Piece Ceramic Knife and Cutting Board Set - Black Handle

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16896268060

Rosewill RHKN-13002 5-Piece Ceramic Knife and Cutting Board Set - Black Handle

Learn more about the 5-Piece Ceramic Knife and Cutting Board Set - Black Handle

Customer Reviews of 5-Piece Ceramic Knife and Cutting Board Set - Black Handle

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info