Gemstone Hardness. The Mohs scale of mineral hardness was created by German mineralogist, Friedrich Mohs, in 1822 to measure the relative hardness or scratch resistance of various minerals. He based it on ten readily available minerals. As it is an ordinal scale, two minerals must be compared to decide which is harder. The scale is neither linear nor logarithmic.
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Black Gloss Acrylic Lacquer Rust-Oleum Automotive 12 oz. Black Gloss Acrylic Lacquer Spray Paint (Case of 6) is a premium Automotive formulation designed to give a lustrous durable finish. Our formula dries quickly has superior adhesion to metal and dries to high gloss sheen. Once dry it can be machine or hand buffed for ... More + Product Details Close.