Details
Brand
Venev Industrial Diamonds
Series
Gemini
Form Factor
6" Single Sided Narrow Edge Pro
Backing
Narrow anodized aluminum blank compatible with Edge Pro
Working Surface
150 x 12mm (6" x ½"), curvature radius 50mm
Total Thickness
8mm
Abrasive
Synthetic monocrystalline diamonds
Binder
M2-01 - Copper-tin bronze alloy.
Material Thickness
2mm
Recpmmended Routine
Water or dry
Grit Rating 📊:
Coarse Medium Fine Extra Fine
Available Grits:
F80F150F240F400F800F1200
Grit Scale:
F Grit (FEPA-F)
Abrasive Standards:
FEPA-F (grit designation) and GOST 9206-80 (regional standard)
Description

Curved Venev Bonded Diamonds are used for sharpening inwardly curved blades on Hapstone knife sharpeners. Diamond sharpening stones offer excellent performance in sharpening knives of any steel. The working surface is curved. Curved diamonds are designed to sharpen kukris, karambits, hawkbills, scythes and any type of recurved blades.

Curved Diamonds consist of a 2mm-thick diamond-bearing layer on a metal base. The diamond-bearing layer contains evenly distributed diamond grains with metal bonding. Metal bonding gives the sharpening diamond stone a long lifespan.

Venev Diamonds are available in a wide range of grit from F80 (200μm) to F1200 (3μm).

Specification
  • Working surface: 150 x 12mm (6" x ½")
  • Abrasive: Synthetic Diamonds with copper-tin alloy bonding
  • Curvature: 50mm
  • Geometry tolerance: up to 0.2mm
How to use

Venev Diamonds are recommended to be used with water as lubricant for the best feedback. The diamond does not absorb water. Splash water on the stone's surface. Dry usage is acceptable practice.

Venev Diamonds may have the geometry tolerance up to 0.2mm. Because diamonds are curved, extra lapping by a customer is not permitted. Gemini diamonds don't require any preparations.

Gemini diamonds may seem bald out-of-the-box. This is normal.

Gemini diamonds may become darker over time due to natural metal oxidizing. It does not affect the sharpening.

Venev Product Matrix

 

Code Diamond Series CBN Series Dimensions Bond Class
CBR Cerberus 100×17×10×2×2 Resin Dual‑sided Premium
UMI Ursa 150×16×10×1×1 Resin Dual‑sided Standard
CEN Centaur Centaur³ 150×25×10×1×1 Resin Dual‑sided Standard
CMA Greater Dog 98×40×10×1×1 Resin Dual‑sided Standard
PHE Phoenix 200×83×10×1×1 Resin Dual‑sided Standard
DRA Dragon 200×83×12×2×2 Resin Dual‑sided Premium
SCO Scorpion 100×25×8×2 Resin Single‑sided Mounted
ORI Orion Orion³ 150×25×6×3 Resin Single‑sided Mounted
SGR Archer 𝘎𝘦𝘯𝟤⌛ Archer³ 150×25×3 Metallic Single‑sided Variative
GEM Gemini 𝘎𝘦𝘯𝟤🚀 150×12×3 R40 Metallic Single‑sided Mounted
SCL Sculptor🚀 150×12×3 Metallic Single‑sided Mounted

Resin Dual Premium Resin Dual Standard Resin Single Mounted Metallic Dual Solid Metallic Single Mounted 🚀 Released ⌛ Soon

Dimensions notation.
Monolayer solid abrasives have 3 numbers: length × width × thickness.
Single-sided abrasives with backing have 4 numbers: length × width × full thickness × thickness of abrasive.
Dual-sided abrasives have 5 numbers: length × width × full thickness × thickness of abrasive #1 × thickness of abrasive #2 (both sides)
If thickness is variable, the minimum thickness is noted.
For curved abrasives, a radius of curvature inmm is added: R40.

Metallic Binders (MMC)
  • M2-01 - Copper-tin bronze alloy.
  • MS-1 - Metal-matrix composite (MMC) - Copper-tin bronze alloy reinforced with silicon carbide.
  • MB-1 - Metal-matrix composite (MMC) - Copper-tin bronze alloy reinforced with boron carbide.
  • MS-1A - Metal-matrix composite (MMC) - Aluminum-copper alloy reinforced with silicon carbide.
Resin Binders
  • B1-10 - Boron-modified phenolic resin (BPF) composite - Made of powdered bakelite, copper additive
  • B2-01 - Boron-modified phenolic resin (BPF) composite - Made of liquid bakelite, iron additive (softer than В1-10)
  • В2-01М - Boron-modified phenolic resin (BPF) composite - Made of liquid bakelite, copper additive (softer than В2-01)
  • OSB (OCB) – A proprietary phenolic resin composite.

(OSB and OCB refer to the same binder; the difference arises from a transliteration quirk of the Cyrillic “ОСБ,” which can be rendered as either “OSB” or “OCB” in Latin script.)

Pressure Control Notes

Pressure control means applying only the minimum, steady force needed for the abrasive to begin cutting. With guided systems, you are holding the stone, guide rod, and stone holder in the air, so the total mass matters. A lighter setup improves tactile feedback and makes it easier to keep pressure consistent.

Why It Matters
  • Edge integrity: Excess pressure can bend the apex and move contact away from the actual cutting edge.
  • Cutting efficiency: Too much force causes metal deformation instead of clean cutting, reducing sharpness and polish.
  • Abrasive wear: Overload accelerates uneven wear, grain chipping, and unwanted scratches.
  • Geometry control: High force makes it harder to maintain angle accuracy, especially on thin bevels or low angles.
  • Heat and fatigue: More pressure creates excess friction and heat, which can harm both the edge and the user’s consistency.
Best Practices
  • Start light: Increase pressure only until you feel the abrasive begin to cut, then keep it steady.
  • Reduce with finer grit: The finer the stone, the lighter the touch required.
  • Maintain consistency: Equal pressure on both sides removes previous scratches and ensures even refinement.
  • Use smooth strokes: Controlled, deliberate movements improve feedback and angle stability.
  • Keep it lightweight: Choose light stones, guide rods, and holders for better control and less hand strain.
When Pressure Is Too High
  • Loss of bite: The abrasive stops cutting effectively even as force increases.
  • Edge rollover: The apex deforms or folds, forcing a return to a coarser grit.
  • Random scratches: Damaged abrasive grains leave isolated, deep marks.
  • Uneven stone wear: The surface loses flatness faster, reducing accuracy and finish quality.

Bottom line: Let the abrasive do the work. Light, steady pressure with a lightweight setup yields sharper edges, longer stone life, and more predictable results.

Customer Reviews
Grand Logarithmic Grit Chart
Questions and Answers