Jet Cutting Rough Jet is essentially hard coal. It's light, cuts very quickly with diamond tools, but can also be cut with hand files. It is a good solid black material for inlay, intarsia, small carvings and cabochons. Jet polishes easily with tin oxide, and a higher polish can be obtained with Zam, or other wax-based polishing compound. Mohs hardness 2.5 to 4.
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