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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from ...Show synopsisThis historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ... stones are named "star sapphire" and "star ruby." The artificial rubies and sapphires should all be called scientific ruby or sapphire, and not "reconstructed" or "syntJietic" as none are made to-day from small, real rubies, and as the process is in no sense a chemical synthesis. Chrysoberyl. Leaving the corundum gems we come next to chrysoberyl. When the gems furnished by this mineral are of a fine green by daylight, and of a raspberry red by artificial light, as is sometimes the case, they should be called "Alexandrites" (after the Csar Alexander II., in whose dominions, and on whose birthday, the first specimens are said to have been discovered). When chrysoberyl is of fibrous or tubular internal structure it affords cat's-eyes (when cabochon cut), and these should be specifically named as "chrysoberyl cat's-eye" to distinguish them from the less beautiful and less valuable quartz-cat's-eyes. Other varieties of chrysoberyl (most of those marketed are of a greenish yellow color) are correctly named simply "chrysoberyls." Such stones are, however, sometimes incorrectly called "chrysolite" by the trade, and this practice should be corrected, as the term chrysolite applies correctly only to the mineral olivine which gives us the peridot. Spinel. Next in the order that we have chosen comes "spinel" The more valuable spinels are of a red color that somewhat closely approaches the red of some rubies. Such red spinels should be called "Ruby spinel" (and not spinel ruby). The stones themselves sometimes get mixed with corundum rubies (they are frequently found in the same gem gravels), and this makes it all the more necessary that both stones and names should be clearly distinguished. Some dealers call reddish spinels "Balas ruby" (rose red), and...Hide synopsis
Description:New. This item is printed on demand. This is a pre-1923...New. This item is printed on demand. This is a pre-1923 historical reproduction that was curated for quality. Quality assurance was conducted on each of these books in an attempt to remove books with imperfections introduced by the digitization process. Thoug.
Description:New. This item is printed on demand. This is a reproduction of...New. This item is printed on demand. This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or wer.
Description:New. This item is printed on demand. This is an EXACT...New. This item is printed on demand. This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as miss.
Description:New. This item is printed on demand. This is an EXACT...New. This item is printed on demand. This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as miss.
Description:New. BRAND NEW ITEM! 100% Satisfaction Guarantee. Tracking...New. BRAND NEW ITEM! 100% Satisfaction Guarantee. Tracking provided on most orders. Buy with Confidence! Millions of items sold!
