Diamond Drill Bits

Diamond Drill Bits – Solid Tip, Hollow Core, Sintered & Donut Burs for Stone, Glass & Ceramic

Our Diamond Drill Bits collection covers every drilling application from ultra-fine 0.4mm jewelry wire holes through to 50mm donut burs for large-diameter core work in stone, glass, ceramic, porcelain tile, sea glass, and hard minerals. Choose from solid tip bits for precision small-diameter drilling, hollow core bits for clean larger bores, sintered tip bits for high-volume hard mineral drilling, and diamond donut burs for specialty curved and large-diameter applications.

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Drill Bit Types

Type Diameter Range Shank Size Best For Price Range
Solid Tip Diamond Bits 0.4mm – 3mm 1/8" (3mm) Jewelry wire holes, bead drilling, precision engraving on stone & glass From $11.00
Hollow Core Diamond Bits 3mm – 25mm 1/4" – 3/8" Larger bore holes, core drilling through slabs and tiles From $12.00
Sintered Tip Diamond Bits 1mm – 10mm 1/8" – 1/4" High-volume drilling, harder minerals, extended bit life From $36.00
Diamond Donut Burs 30mm – 50mm Various Large-diameter specialty drilling, curved surface work $29.00 – $60.00

Grit Options

Grit Cutting Speed Finish Quality Best For
80 Grit Fast Standard General drilling, rapid material removal, hard stone
400 Grit Moderate Fine, smooth bore Delicate materials, clean hole edges, glass and ceramic

Compatible Applications

  • Gemstone bead drilling — 0.4mm–3mm solid tip bits for jewelry wire holes in stone and crystal beads
  • Sea glass and beach glass drilling — clean holes for pendants and jewelry without chipping
  • Stone slab core drilling — hollow core bits for 3mm–25mm bores through agate, jasper, and granite slabs
  • Ceramic and porcelain tile drilling — clean, chip-free holes for installation and mosaic work
  • Glass drilling — art glass, fused glass, stained glass, and optical glass hole drilling
  • Hard mineral drilling — sintered tip bits for obsidian, petrified wood, labradorite, and hard gemstones
  • Rotary tools and drill press — 1/8" and 1/4" shanks for Dremel, flex shaft, and bench drill press use

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Frequently Asked Questions

  • Q: What size diamond drill bit do I need for making jewelry holes in stone?
    A: For standard jewelry wire holes, use 0.8mm–1.5mm solid tip diamond bits. For thicker wire or cord, use 2mm–3mm bits. Always drill wet with water cooling to prevent heat cracking in heat-sensitive stones like opal and turquoise.
  • Q: Should I use solid tip or hollow core diamond drill bits for drilling stone?
    A: Use solid tip bits for small-diameter holes (0.4mm–3mm) in beads, pendants, and precision work. Use hollow core bits for larger bores (3mm–25mm) where a clean, chip-free hole edge is needed. Hollow core bits remove a core plug rather than grinding through the full diameter, producing cleaner results on larger holes.
  • Q: How do I drill through glass without cracking it?
    A: Always drill glass wet — use a water swivel adaptor or keep the drill area submerged in a shallow water bath. Use a 400 grit bit for cleaner edges on glass. Apply light, steady pressure and let the diamond do the cutting without forcing. Start at low speed and increase gradually once the bit has established a starting groove.