Profile: Ed's House of Gems Ltd. offers a full line of lapidary equipment and supplies. We offer grinding machines, slab saws, trim saws, diamond blades, rock picks and grinding wheels. The model 3A rock tumbler is a 3 lb capacity tumbler for using with steel shots for polishing metal. The TS8 trim saw is a heavy duty 8" trim saw. It cuts large slabs with its 10½"x 15" work surface and centered blade.