Felt Polishing Bobs – Mixed Shapes (12 Piece Pack)

Precision Polishing | Assorted Shapes | Gemstone Finishing

Grotto Gemstones Mixed Shape Felt Polishing Bobs are designed for the final polishing and finishing stages of gemstone cutting, cabochon preparation and detailed lapidary work.

Manufactured from dense, compressed felt, these versatile polishing bobs provide an effective surface for applying compatible polishing compounds, helping achieve a smooth, polished finish on properly prepared gemstones.

The assorted shapes offer greater flexibility when polishing curved surfaces, flat areas, edges and detailed contours where different polishing profiles are required.

Suitable for working with Australian opals, quartz, agate and other compatible gemstones using the appropriate polishing compounds.

What's Included

Each pack contains 12 assorted felt polishing bobs in a selection of shapes for different polishing applications.

The mixed selection allows you to choose suitable bob shapes for individual polishing tasks while keeping separate bobs for different polishing compounds and abrasive grades.

Features & Benefits

• Dense felt construction for controlled gemstone polishing.

• Assorted shapes for curves, contours, edges and detailed finishing.

• Suitable for use with compatible diamond polishing pastes, cerium oxide and aluminium oxide polishing compounds.

• Twelve polishing bobs offering flexibility for different polishing applications.

• Helps reduce cross-contamination when separate bobs are dedicated to individual polishing compounds.

• Suitable for compatible rotary hand tools and flex-shaft machines.

• Useful for Australian opals and a variety of other gemstones.

• Ideal for beginners, hobbyists and experienced lapidary enthusiasts.

Grotto Gemstones Workshop Tip

Apply a small amount of your chosen polishing compound to the felt bob and polish using light, controlled pressure.

Select a bob shape that best suits the gemstone surface being polished. Rounded shapes are useful for curves and contours, while flatter profiles can be helpful for broader surfaces and edges.

Avoid excessive speed or pressure, as friction can generate heat and potentially damage heat-sensitive gemstones, particularly Australian opals.

For the best results, ensure scratches from previous grinding and sanding stages have been removed before beginning the final polishing process.

Important: We recommend keeping separate felt bobs for each polishing compound and abrasive grade to prevent contamination from coarser particles.

Clean and dry your polishing bobs appropriately after use and store them separately to maintain their polishing performance.

Safety: Always wear suitable eye protection and use effective dust control. A correctly fitted P2 respirator is recommended where airborne hazardous dust may be present. Keep fingers clear of rotating polishing bobs and ensure all rotary tools are operated according to the manufacturer's instructions. Keep electrical equipment protected from water and use only compatible accessories at suitable operating speeds. Children must be closely supervised, and powered polishing equipment should only be used by suitably trained operators.

Grotto Gemstones & Tools Australia

Supporting your gemstone journey, from rough to polished.