8 in x 1/2 in Diamond Standard Faceting Lap for Gemstone Faceting & Grinding

The 8 in x 1/2 in Diamond Standard Faceting Lap is an expanded-diameter, high-precision lapidary tool engineered for gemstone cutting, facet pre-forming, and fine grinding. Manufactured with a rigid, precision-ground solid steel core electroplated with high-density industrial diamond particles, this 8-inch standard faceting lap delivers exceptional flatness, greater peripheral grinding speed, and aggressive yet controlled stock removal across extra-hard gem materials. Designed with a standard 1/2" center arbor hole, it runs true without flex or runout on standard 8-inch gemstone faceting machines.

Key Features

• Precision-Ground Solid Steel Core: Resists warping, dish-out, and deflection under facet pressure, providing an uncompromisingly planar reference surface for crisp meet-points and sharp facet junctions.
• Expanded 8" Working Surface: Provides greater usable surface area and higher peripheral cutting speeds than 6" laps, accelerating facet cutting on larger stones and high-volume runs.
• Uniform Electroplated Diamond Coating: High-concentration monocrystalline diamond grit provides consistent cutting action and extended lap service life.
• Complete Progressive Grit Range: Available from coarse 60 grit for fast roughing and pre-forming down to ultra-fine 3000 grit for scratch-free pre-polish facet alignment.
• Universal 1/2" Arbor: Precision center bore engineered for standard 8" faceting machines, flat lap grinders, and precision lapidary spindles.
• Versatile Hard Material Grinding: Exceptionally effective on hard gemstones including corundum (sapphire, ruby), topaz, beryl (emerald, aquamarine), quartz, spinel, and tourmaline.

Applications

• Gemstone Faceting: Rough pre-forming, pavilion facet cutting, crown facet placement, table cutting, and girdle shaping on precious and semi-precious stones.
• Precision Lapidary Lapping: Flattening cabochon backs, pre-polishing large mineral flats, and squaring gemstone preforms.
• Glass & Technical Ceramics: Edge beveling, chip repair, and planar leveling on optical glass blanks and structural ceramic components.

Technical Specifications

• Diameter: 8 inches (203 mm)
• Arbor Hole: 1/2 inch (12.7 mm)
• Abrasive Material: Premium Industrial Diamond
• Bond Type: Precision Electroplated Bond
• Base Plate: Solid Ground Steel Plate
• Available Grits: 60, 80, 120, 180, 220, 280, 360, 600, 1200, 3000
• Recommended Operating Speed: 350–1200 RPM

Operating Guidelines

• Always operate with continuous water drip or recirculating coolant to prevent heat buildup, stone thermal shock, and swarf loading.
• Apply light, even facet pressure; allow the sharp diamond matrix to cut freely without forcing the workpiece.
• Rinse thoroughly with clean water after each grinding session and dry completely before storage to protect the steel base plate.