Download or read book The Chemistry, Properties and Tests of Precious Stones (Esprios Classics) written by John Mastin and published by . This book was released on 2020-12-22 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: "What constitutes a precious stone is the question which, at the onset, rises in the mind, and this question, simple as it seems, is one by no means easy to answer, since what may be considered precious at one time, may cease to be so at another. There are, however, certain minerals which possess distinctive features in their qualities of hardness, colour, transparency, refractability or double refractability to light-beams, which qualities place them in an entirely different class to the minerals of a metallic nature. These particular and non-metallic minerals, therefore, because of their comparative rarity, rise pre-eminently above other minerals, and become actually "precious.""