Diamond Compound Pastes

Diamond Polishing Compound Paste – Graded Diamond Particles for Mirror-Quality Finishing

Precisely graded diamond particles suspended in a balanced carrier medium for consistent, controlled polishing on glass, gemstones, marble, granite, tungsten carbide, stainless steel, and tool steel. Available in 5g ($8.00) and 50g ($16.00) sizes across a grit range from 2,000 through 80,000. Compatible with felt, leather, canvas, and cloth polishing surfaces, copper and tin faceting laps, and leather strops for knife and tool finishing.

🔥 Shop Diamond Polishing Compound – From $8.00

Product Format Guide

Size Grit Range Price Best For
5g 2,000–80,000 $8.00 Trying a new grit, occasional use, specific projects
50g 2,000–80,000 $16.00 Regular lapidary polishing, faceting, knife finishing — 5× lower cost per gram

Grit & Micron Selection Guide

Grit Particle Size Stage Application
2,000–3,000 ~6–9 micron Pre-polish Scratch removal, surface preparation after grinding
8,000–10,000 ~1.5–2 micron Fine polish High-gloss surface finishing on stone and metal
14,000–15,000 ~1 micron Ultra-fine polish Near-mirror surface quality on gemstones and steel
50,000–80,000 0.25–0.5 micron Mirror polish Final mirror-quality polish on gemstones, carbide, and steel

Compatible Applications

  • Gemstone cabochon polishing — agate, jasper, quartz, obsidian mirror finish on felt, leather, or canvas laps
  • Gemstone faceting — charging copper and tin laps for pre-polish and final mirror polish stages
  • Knife and tool sharpening — leather strop charging for mirror-edge finishing on tool steel and stainless steel
  • Tungsten carbide polishing — one of the few abrasives effective on Mohs 9–9.5 carbide tools
  • Glass polishing — fine diamond compound on felt or cloth for glass surface finishing
  • Metal fabrication — stainless steel, high-speed steel, and precision metal mirror finishing

Related Tools

Frequently Asked Questions

  • Q: What grit diamond polishing compound do I need to get a mirror finish on agate cabochons?
    A: Use a progressive sequence: 3,000 grit to remove fine grinding scratches, 8,000–14,000 grit for high-gloss polish, then 50,000–80,000 grit on a tin or felt lap for the final mirror surface.
  • Q: How do I use diamond polishing compound to sharpen and polish a knife blade to a mirror finish?
    A: Start with 2,000–3,000 grit on a leather strop to remove finest scratches, progress to 8,000–14,000 grit for high-polish, and finish with 50,000–80,000 grit for a true mirror edge. Apply a tiny amount and wipe clean between grit stages.
  • Q: What is the difference between 5g and 50g diamond compound?
    A: The 5g size ($8.00, $1.60/gram) is ideal for occasional use or trying a new grit. The 50g size ($16.00, $0.32/gram) offers 5× lower cost per gram and is the better value for regular lapidary polishing, faceting, or knife finishing.