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Description
DEGUSSIT® Ruby® Stones, Half Round 4" x 3/8"Gesswein Ruby Stones and Files are made by Friatec Degussit from pure, sintered crystals of synthetic ruby. No bonding material is used, so these stones are extremely hard and resistant to changes in shape. This is particularly important for quality precision grinding and finishing. In addition, since Gesswein Ruby Stones have an outstanding resistance to wear, they are more economical to use than other comparable tools. Use dry or with Gesswein
Gesswein Ruby Stones and Files are made by Friatec-Degussit from pure, sintered crystals of synthetic ruby. No bonding material is used, so these stones are extremely hard and resistant to changes in shape. This is particularly important for quality precision grinding and finishing.
In addition, since Gesswein Ruby Stones have an outstanding resistance to wear, they are more economical to use than other comparable tools.
Use dry or with Gesswein Stoning Oil to grind, touch up or debur steel and carbide parts. Ruby stones are also recommended for use on materials such as glass, quartz and porcelain.
All are 100mm (4") long, medium grit in a variety of shapes & sizes.
*All dimensions have tolerance of ±0.1mm.
Ruby Stones are the ideal choice for deburring, blending, dressing, and fine polishing of molds & dies made of hard metals such as hardened tool steel, carbide and surgical stainless steel. Jewelers use them for sharpening of carbide and high speed steel engravers and other tools.
Mold & Die Uses:
In addition, since Gesswein Ruby Stones have an outstanding resistance to wear, they are more economical to use than other comparable tools.
Use dry or with Gesswein Stoning Oil to grind, touch up or debur steel and carbide parts. Ruby stones are also recommended for use on materials such as glass, quartz and porcelain.
All are 100mm (4") long, medium grit in a variety of shapes & sizes.
*All dimensions have tolerance of ±0.1mm.
Ruby Stones are the ideal choice for deburring, blending, dressing, and fine polishing of molds & dies made of hard metals such as hardened tool steel, carbide and surgical stainless steel. Jewelers use them for sharpening of carbide and high speed steel engravers and other tools.
Mold & Die Uses:
- Deburring ejector pin holes.
- General deburring and edge breaking on mold steel and carbide.
- Blending a surface where a straight edge meets a radius.
- Polishing highly detailed areas on dies (after dressing Ruby Stone to a fine point).
- Ruby Midget Files (see "Related Products" below) can be used in an Ultrasonic Handpiece for fast deburring and blending in ribs and other hard to reach areas. Ruby Stones cut faster than our very popular Super Ceramic Stones.
- Fine polishing of surgical stainless steel instruments.
- Polishing and shaping of carbide & high speed steel gravers.
These fine grinding stones are made of Degussit DD57 (sintered ruby) which is a homogenous mixed-crystal material. The main element is aluminum oxide. The characteristic red colour is the result of an admixture of chromium oxide.
Because Degussit DD57 is a homogenous ceramic material which is bondfree, these stones cannot be classified in terms of "grit" but only in terms of the average grain size. The average grain size of types "fine" and "medium" is about 10µ. Type "coarse" has two average grain sizes at about 10µ and 100µ.
No bonding material is used, so these stones and files are extremely hard and resistant to changes in shape. This is particularly important for quality precision grinding and finishing.
In addition, since Degussit Ruby Stones and Files feature outstanding resistance to wear, they are more economical to use than other comparable tools.
Use dry or with Gesswein Stoning Oil to grind, touch up or debur steel and carbide parts. Also recommended for use on materials such as glass, quartz and porcelain.
Because Degussit DD57 is a homogenous ceramic material which is bondfree, these stones cannot be classified in terms of "grit" but only in terms of the average grain size. The average grain size of types "fine" and "medium" is about 10µ. Type "coarse" has two average grain sizes at about 10µ and 100µ.
No bonding material is used, so these stones and files are extremely hard and resistant to changes in shape. This is particularly important for quality precision grinding and finishing.
In addition, since Degussit Ruby Stones and Files feature outstanding resistance to wear, they are more economical to use than other comparable tools.
Use dry or with Gesswein Stoning Oil to grind, touch up or debur steel and carbide parts. Also recommended for use on materials such as glass, quartz and porcelain.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.0 ★★★★★
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Product Reviews
★★★★★ 5
So Good!
Color: 262 BLACK BROWN, Size: 1 Count (Pack of 1)
This is my absolute favorite bow pen I've ever tried.
The brush tip is incredibly fine and makes each stroke a perfect hair like finish.
I tend to get heavy handed with other options like brow powders so having an option for thin hair like stokes makes it incredibly hard to taken it too far.
The tip doesn't dry out to the point of skipping or Inconsistency without you knowing its time to refresh it by capping and shaking, but I do find that it comes back refreshed and even better the more you repeat the capping and shaking step between brows.
Easy to hold and design.
I wasn't totally blown away with the brow gel it comes with attached to the pen when it comes to hold power. It doesn't flake at all and doesn't leave a cast of white or sheen to the brow, which is a plus. It's just a nice way to loosely set the brow after application.
There is some wiggle room with wiping the product off with a q tip if a mistake is made, but once the pigment is dry, it doesn't budge all day, even after intense exercise or humid conditions.
I'll be repurchased this like... now, and hope it never gets discontinued!
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Reviewed in the United States on April 10, 2024
★★★★★ 1
Defective product from Amazon.
Color: 255 SOFT BROWN, Size: 1 Count (Pack of 1)
I have used this product many times and I think it is a good product. I usually buy it at Target.
The product I received from Amazon was defective. The pen was totally dried out and I was not able to paint a brow. There was liquid in the brush side, but it is colorless and meant to be a finish to make the color last longer. Maybe just a one time fluke, but I'd purchase this elsewhere.
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Reviewed in the United States on June 7, 2026
★★★★★ 5
Eyebrows!
Color: 257 MEDIUM BROWN, Size: 1 Count (Pack of 1)
Great color and great price!
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Reviewed in the United States on April 29, 2026
★★★★★ 5
Solid edger for the price!
Easy to assemble and works well for my needs edging the driveway and sidewalk! Reasonable price and seems fairly well made so far! I’ve only used it a couple of times but does the job well!
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Came fast!
Works great ! I love it!!!
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Reviewed in the United States on June 5, 2026