A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public

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Excerpt: ...appear reasonable that such was the case. He was next shown that his small true topazes scratched his large stones easily, but the large ones could get no hold upon the surfaces of the small ones. (It will be remembered that topaz has a hardness of 8, while quartz has a hardness of 7.) The explanation then followed that the two lots were from two entirely distinct minerals, topaz and quartz, and that the former was harder, took a somewhat better polish, and was more rare (in fine colors) than quartz. Of course ...

A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2016, Palala Press

ISBN-13: 9781358448508

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2016, Palala Press

ISBN-13: 9781359098429

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2016, Wentworth Press

ISBN-13: 9781373393760

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2016, Wentworth Press

ISBN-13: 9781373393784

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2015, Andesite Press

ISBN-13: 9781297572135

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2013, Tredition Classics

ISBN-13: 9783849189174

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2013, Tredition Classics

ISBN-13: 9783849198039

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2012, Rarebooksclub.com, Miami FL

ISBN-13: 9781153809580

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2010, Nabu Press, Charleston SC

ISBN-13: 9781172562626

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2010, Nabu Press, Charleston SC

ISBN-13: 9781146733250

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A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public 2010, Nabu Press, Charleston SC

ISBN-13: 9781149014417

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A Text Book of Precious Stones for Jewelers and the Gem-Loving Public 2009, BiblioLife, Charleston SC

ISBN-13: 9781103888191

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A Text Book of Precious Stones for Jewelers and the Gem-Loving Public 2009, BiblioLife, Charleston SC

ISBN-13: 9781103888115

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