The Dremel is a brand name for a compact, high-speed rotary hand tool manufactured by the Dremel company (now a subsidiary of Robert Bosch GmbH) and has become so ubiquitous in hobby workshops that the name is frequently used generically to describe the entire category of similar instruments. Operating at variable speeds typically ranging from approximately 5,000 to 35,000 rpm, Dremel tools accept a wide range of small interchangeable accessories — including diamond-coated burrs, mounted abrasive points, carbide carving bits, and felt or rubber polishing wheels — making them adaptable to a broad variety of light lapidary and jewellery tasks.

Construction and Accessories

The tool's collet system accepts accessories with shafts of 3.2 mm (⅛ inch) diameter as standard, though adaptor collets allow smaller shanks. For lapidary and jewellery applications, the most relevant accessories include:

• Diamond burrs — sintered or electroplated diamond points in ball, cylinder, cone, and flame profiles, used for carving, engraving, and shaping softer to medium-hard materials.
• Mounted points — abrasive wheels and cylinders bonded with aluminium oxide or silicon carbide, used for grinding and smoothing.
• Diamond-coated drill bits — used for drilling through pearl, shell, coral, and softer gemstones such as turquoise, malachite, and amber.
• Felt and rubber polishing wheels — used with polishing compounds for final surface finishing on metal and softer stones.

A flexible shaft attachment, available as a standard accessory, significantly improves control during fine detail work by separating the heavy motor housing from the working handpiece — an arrangement that more closely resembles a dental-style pendant drill.

Lapidary Applications

Within the lapidary context, Dremel-type tools are best suited to tasks involving softer materials (those falling below approximately 6 on the Mohs scale) or to detail and finishing work where the small burr diameter is an advantage. Practical applications include:

• Carving and engraving amber, jet, coral, shell, and softer ornamental stones such as serpentine, soapstone, and howlite.
• Drilling beads and pendants in pearl, shell, and porous stones where water cooling can be managed manually.
• Cleaning matrix from mineral specimens and fossils.
• Light surface finishing and polishing of metal findings and settings.
• Inlay work and channel preparation in softer materials.

Limitations in Professional Gemstone Work

The Dremel's limitations are directly relevant to anyone considering it as a primary lapidary instrument. The tool's small motor produces relatively low torque, and the collet system — while adequate for light work — lacks the rigidity and concentricity demanded by precision gemstone cutting or sustained hard-stone carving. At high speeds, lateral pressure on a diamond burr can introduce vibration and chatter that compromises surface quality on hard materials such as quartz, feldspar, or corundum. Heat management is also a concern: the small accessories dissipate heat poorly, and without continuous water cooling — difficult to maintain with a hand-held tool — there is risk of thermal fracture in heat-sensitive stones such as opal, tanzanite, or emerald.

Professional gem carvers working in hard stone (quartz and above) typically employ dedicated flex-shaft machines with higher-torque motors, or purpose-built ultrasonic and pneumatic carving systems, which offer superior speed control, better collet precision, and more robust accessory ranges. The Dremel occupies a legitimate and useful niche, but it is not a substitute for professional carving equipment when working with hard or valuable material.

In the Trade

Dremel tools are sold through general hardware retailers and hobby suppliers worldwide and represent a low entry-cost point for students and hobbyists beginning to explore lapidary carving or jewellery making. Their accessibility has made them a standard recommendation in introductory lapidary curricula for initial familiarisation with rotary carving techniques. However, instructors consistently advise students to progress to more capable equipment before attempting work on hard or precious gemstones.