Free Shipping | 30-Day Returns
Free Shipping | 30-Day Returns
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Take control of every stage of your tumbling process with premium Lortone graded silicon carbide grit, engineered for consistency, performance, and dependable results. Milled to precise particle sizes and tightly screened for uniformity, this graded grit delivers a predictable cutting action—ideal for lapidaries who want repeatable, professional-quality finishes.

80 Grit (Coarse Shaping)
Start strong with 80 grit, a coarse abrasive designed for aggressive material removal and fast shaping. Perfect for smoothing rough edges and beginning the transformation from raw stone to refined form, this grit provides a uniform cut that helps eliminate major imperfections while preparing your stones for the next stage.

120 Grit (Refining & Smoothing)
Step up to 120 grit to refine your work and improve surface quality. This medium-grade abrasive smooths out scratches left from the coarse stage and begins developing a more even, pre-polished surface—setting the foundation for higher grit finishing steps. Similar Lortone medium/fine grits are specifically used to improve surface finish and remove scratches from earlier stages.

Crafted from extremely hard, sharp silicon carbide, these abrasives cut efficiently and continually fracture to expose fresh cutting edges—making them one of the most effective and reliable choices for rock tumbling.

Whether you’re running a rotary tumbler or working on precision lapidary projects, Lortone graded grit gives you the control and consistency needed to produce beautifully shaped, smoothly finished stones every time.

Shipping Information

Free Ground Shipping in the continental USA.

At the Gemstone Lab, we aim to deliver your lapidary tools and supplies quickly and safely.

That's why we only ship using UPS, FedEx, or USPS.

We offer free ground shipping on all orders within the United States. No minimum purchase is required -  every order qualifies! Our ground shipping is handled by trusted carriers to ensure your items arrive safely and on time.

What to Expect When You Place an Order

Once your order is confirmed, you'll receive a confirmation email detailing your purchase and order number. As soon as your order is shipped, you wlll receive a notification with all shipping details and a tracking number so you'll know exactly when your package will arrive. 

Fast Order Processing

We start processing your order right away. Most orders ship withing 1-2 business days, so you can get started on your next project before you know it. 

Shipping Times

Delivery times vary based on your location. Most U. S. order arrive within 3-6 business days. Expedited shipping options are also available at checkout for certain items for an additinal fee if you needs a product sooner. Made to order products cannot be guaranteed withing this timeframe are is noted on each product page. 

International Shipping

We currently do not offer shipping outside of the United States.

Secure Packaging

Every order is carefully packed to ensure your items arrive in perfect condition. Fragile tools, blades, and other delicate lapidary items are given extra care during packaging and boxing to prevent damage in transit.

 

If you have any question about our shipping policies or need assistance with a product, please don't hesitate to reach out to our friendly customer support team. We're happy to help make your lapidary adventure more fun in any way we can! Give us a call at 855-487-9637.