Diamond Whetstones

Compared to oil and water stones, diamond whet stones are the best quality sharpening stone on the market. They deliver very fast blade and tool edge sharpening over the entire stone surface, and are more likely to remain flat than other types of stones.
While they are initially more expensive, they will also last the longest, so the long-term cost will be lower than other stones.

KGS Diamond whetstones are a precision diamond sharpening tool with metal bonded diamonds.
Well suited for very fast sharpening or deburring any hard or brittle material.
KGS Diamond sharpening stones work much faster and have an incredible long life! If you use the whetstones on a daily basis and maintain them properly, the diamond will likely last for a few years. For those that use them less frequently, it's likely the stone will last from 10 to 20 years!
Diamond sharpening stones can be used dry or wet, but wet is recommended. When using them wet, use water (not oil).
Made with Swiss Diamond Technology®

Ideal for manual sharpening of chisels, axes, shears, clippers, mower blades, serrated knives, fish hooks, drill bits and cutting tools, especially those made out of hard and brittle material, like tungsten carbide.



  • For both wet and dry grinding and polishing (use water not oil)
  • Manual control allows extremely sharp edges
  • Incredibly long life compared to traditional whet stones
  • Aluminum support base with rubber feet
  • Well suited to sharpening, deburring and defect removal
  • All stones measure 6" x 2" / 150 x 50 mm
  • Very coarse #120 grit 
  • Coarse #200 grit 
  • Fine #400 grit 
  • Dual #200/400 grit  
  • All $95 each incl GST

Combination 2-in-1; two grit sizes on one sharpening stone!

KGS Whetstone PRO is available in a combination of grit sizes #200 and #400 (2-in-1).
One part of the sharpening stone is #200 grit (red) and the other part is #400 grit (yellow).
Thanks to the two different grit sizes on one sharpening stone it's easy to switch between coarse grinding with #200 and fine finishing with #400.

$95 incl GST


Dymaxion Sharpener Plate:

Dymaxion Sharpener Plate:
Full sized - 205mm long x 65mm wide
Fitted to rubber bench holder.
Will sharpen and hone nearly all materials including tungsten carbide.
Ideal for plane blades, chisels and many other edged blades and cutters.
Clamp holds diamond plate to bench top.
#400 grit (medium) one side, #1000 grit (super fine) other side
$150 each incl GST

Sharpener Guide to suit above Sharpener plate (honing guide).
Hold plane blades and chisels at correct angle.
$30 each incl GST

Dymaxion Tungsten Carbide Knife Sharpener:

Dymaxion Tungsten Carbide Knife Sharpener:
With suction lever to lock to bench top.
Simply place heel of knife in jaws and drag firmly towards you. Lighter strokes give finer edge.
$22 each incl GST


Dymaxion Diamond Folding Sharpener:

Dymaxion Diamond Folding Sharpener:
#400 grit (medium) for resharpen blunt edges.
#1000 grit (very fine) for touch ups or to make razor shape edges.
Double sided, diamond area 20 x 100mm.
Total length opened - 225mm
$30 each incl GST

Dymaxion Diamond Pen Sharpener:

Dymaxion Diamond Pen Sharpener:
For knives, workshop tools, fish hooks etc
Also for shaping ceramic, stone, glass, metal etc
Profile: 2/3 round & 1/3 flat.
With fish hook sharpener - 6mm round tapering to point.
Use light pressure only
$20 each incl GST

Dymaxion Products have instructions with them.
Always use caution with sharp objects.
Diamonds can be used in all directions.
Wash in warm soapy water occasionally to stop diamonds getting clogged.

Instructions for KGS whetstone:
Place KGS whetstone on a flat clean surface to avoid wobbling and shaking.
Try the whetstone on your tool in an inconspicuous spot first.
Initially, the stone may feel very coarse. This is from the manufacturing process and will disappear quickly.
The edge of the blade should be sharpening in the middle of the stone, to prevent scratching the edge.
Initially, try in an inconspicuous corner first.
To Sharpen knives - lay blade flat on stone, then elevate the blade's spine by the thickness of the blade (approx 15°). Rub in a circular motion, alternating sides. Initially, use firm pressure to start an edge, then use lighter pressure. 
As the whet stone wears down, more diamonds will be exposed, so the stone will sharpen faster.
Clean up with a soft brush when dry grinding. If wet grinding, dry first, then clean with a brush.
If you think the stone is worn out, try rubbing a glass object (without breaking it) along the stone's edge. If it cuts a groove, it is not worn out.

Dressing stones

Our dressing stones "open up" a diamond blade which have been glazed up as a consequence of cutting hard materials. Depending on the condition (wear) of your diamond blade, it will be necessary to use the dressing stone several times, simply by cutting a few centimeters into it.
Regular use of dressing stones will keep you blade performing at its best.
80 grit, 200mm x 50mm x 25mm Premium Series (Red colour)
(these are a superior, more uniform composition stone and are very effective at sharpening  compared to the Trade series).
$35 each including GST

80 grit, 200mm x 50mm x 25mm Trade series (White colour)
(these are sandier composition than the Premium series, but well priced).
$20 each including GST

To use, ensure you wear eye protection. Cut across the stone in one direction only (not forward and back) to a depth of about half the thickness of the stone (Then the stone can be turned over and the other side used). A few cuts should be sufficient to dress your blade.

To see how to use a dressing stone, see this video (it shows a deglazing a tile saw blade, but the principle is the same).


Prices correct as of 1/11/23 but subject to change.
All prices each, and include GST.

One or two whetstones can fit in an small airbag.
See our Contact Us page for Australia wide regular and express postage prices.

EHWA Weha Sharpener Eze-Lap Bunnings


United Diamond Tools

U9, 84 Barberry Way
Bibra Lake
Western Australia 6163

Telephone: (08) 9434 6878

Email:  sales@udt.com.au