Diamond Flat Hard Wheels

Diamond Flat Hard Wheels – Rigid Diamond Grinding Wheels for Gemstone, Glass & Jewelry

Our Diamond Flat Hard Wheels are rigid, flat-faced diamond grinding wheels engineered for precision cutting and grinding of gemstones, glass, and jewelry components on lapidary bench grinders and rotary tools. The hard bond construction maintains a flat, true grinding surface throughout the wheel’s working life — delivering consistent, accurate stock removal from aggressive coarse shaping at 46 grit through fine pre-polish preparation at 1200 grit. Available in three sizes and two widths to suit every bench grinder setup.

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Available Sizes & Grits

Diameter Width Available Grits Price Range
6" 1.5" 46, 60, 80, 100, 180, 220, 280, 360, 600, 1200 $60.00 – $65.00
8" 1.5" 46, 60, 80, 100, 180, 220, 280, 360, 600, 1200 $80.00 – $95.00
8" 2" 46, 60, 80, 100, 180, 220, 280, 360, 600, 1200 $110.00 – $120.00

Grit Selection Guide

Grit Stage Application
46–60 Coarse grinding Aggressive material removal, initial shaping on rough stone
80–180 Medium grinding Surface smoothing, dome profiling, edge shaping
220–360 Medium-fine Scratch removal, surface refinement
600–1200 Fine / pre-polish Final surface preparation before polishing stages

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Frequently Asked Questions

  • Q: What is the difference between a flat hard wheel and a REZ soft resin wheel?
    A: Flat hard wheels use a rigid bond that maintains a flat, true grinding surface — ideal for precise flat grinding, edge work, and applications requiring a consistent flat contact surface. REZ soft resin wheels use a flexible bond that conforms to curved surfaces — better suited for cabochon dome grinding and curved surface finishing. Choose flat hard for flat work, REZ soft for curved work.
  • Q: What is the widest grit range available?
    A: All three sizes (6" × 1.5", 8" × 1.5", and 8" × 2") are available in the full grit range from 46 through 1200 — covering everything from aggressive coarse shaping to fine pre-polish surface preparation in a single wheel type.
  • Q: Should diamond flat hard wheels be used wet or dry?
    A: Always use wet. Run water over the wheel continuously during grinding to cool the diamond surface, prevent heat damage to the stone or glass, and suppress dust. Most lapidary bench grinders have a built-in water trough — keep it filled and running at all times.
  • Q: Which size flat hard wheel should I choose for my bench grinder?
    A: The 8" × 1.5" is the most versatile size for standard lapidary bench grinders. The 8" × 2" provides a wider grinding surface for larger stones and more aggressive material removal. The 6" × 1.5" suits smaller bench grinders and detail work. Always verify your grinder’s maximum wheel diameter and arbor size before ordering.
  • Q: How does the 8" × 2" wheel differ from the 8" × 1.5"?
    A: The 8" × 2" wheel has a wider grinding face (2" vs 1.5"), providing more grinding surface area for larger stones and faster material removal on wide workpieces. The wider wheel is also more stable for edge grinding and flat surface work on larger lapidary slabs.