very happy to offer you these diamond sharpening stones, the Atoma brand, by
the Japanese manufacturer Tsuboman. The manufacturer is known for its high
quality and technically refined products -- very important with this kind of
product, as there is a wide difference in the quality and durability of the
different diamond stones on the market. They are solid, without the large holes
in the plate one often finds, which can catch smaller blades and do a lot of
damage to the edge. Their surfaces are in general well made, flat with evenly
distributed and precisely graded diamond chips. The chips themselves are
exclusively monocrystaline diamonds, which are much more expensive than
polycrystaline, and are more durable. They are fused to the plate using an
sharpening surface before every use! Never use diamond stones dry. This is bad
for the surface of the diamond stone, and will not sharpen well, either. You
should also be careful not to put too much pressure on the surface when
sharpening, and absolutely not near the edges of the plate, as this can deform
the plate and scrape off the diamond coating.
sharpening stones are, if one takes into account their strengths and
weaknesses, a real alternative to wet grinding wheels and sharpening stones.
Conventional sharpening stones sooner or later become hollowed with use, while
diamond stones remain flat. One cannot flatten the back of a chisel or plane
iron on a grinding wheel, but a diamond stone is ideal for the job. They are
also ideal for removing lots of material, to grind out a notched edge, for
instance. But for honing an edge, sharpening stones are much better, as the
diamond stones can not be made with a fine enough grit for a really good edge.