, gems

corundum, Colombia.12, gems, beryl, emerald

Lleras Codazzi provides an early systematic account of the minerals known from Colombia, combining mineralogical descriptions with information on their Colombian occurrences and localities. Produced as part of the Biblioteca del Museo Nacional, a series intended to document the museum’s collections scientifically while making them accessible to a wider readership, the work forms one of the foundational publications of modern Colombian mineralogy. It covers both common and economically significant mineral species and records occurrences of particular interest to mining and economic geology; later geological literature, for example, cites its discussion of pitchblende and other uranium minerals from Norte de Santander. For gemological research the book is particularly relevant because Lleras Codazzi had already studied the mineralogy of Muzo and its emerald deposits in his 1925 Catálogo descriptivo de los minerales de Muzo, and Los minerales de Colombia places such Colombian mineral occurrences within a broader national mineralogical survey.

gems, lapidary arts, ancient lapidary, Afghanistan, Kabul, bow drill, beads, archaeology, archaeogemology, spectacles, quartz, China, jade

Sinkankas: Fascinating account of an optometrist’s study of the development of spectacles in China that were manufactured from transparent quartz varieties and by the same lapidary methods as were used to carve jade. Four of the illustrations show various stages of work while another is a line drawing of a typical lapidary’s lathe-bench employing foot-treadle propulsion. Another valuable feature of this work is an account of the curious lore associated with wear of quartz spectacles and explaining why the Chinese were of the firm conviction that spectacles made from smoky quartz were soothing to the eyes and helped heal diseases of those organs. Very scarce.

gems, lapidary arts, Jura Mountains, France, Switzerland, gem cutting, faceting

A study of the lapidary industry of the French Jura, particularly the long-established communities of fine-stone cutters around Saint-Claude and the Haut-Jura. Boullier examines the historical development and economic organization of this specialized craft, in which gemstone cutting often supplemented agricultural work during the long winter months. The industry relied on skilled home and workshop labor, with cutters shaping and polishing imported precious and ornamental stones for the jewelry and watch trades, despite the absence of local gem deposits. The work is of particular gemological interest for documenting the organization, techniques, labor conditions and commercial structure of an important European lapidary center at the beginning of the twentieth century.

Corundum, USA.12, North Carolina.12, gems

Lewis presents a detailed study of the corundum deposits and associated basic magnesian rocks of western North Carolina, describing their geographical distribution, geology, mineralogy, and economic importance. He traces a belt of peridotitic and related rocks through the region and examines the relationship of corundum to these ultrabasic bodies and their altered products, including serpentine and talcose rocks. Individual mines and prospects are described, together with the occurrence, character, and quality of their corundum and associated minerals. Lewis discusses the geological origin of the deposits, the alteration of the enclosing rocks, and the manner in which corundum occurs in veins and contact zones. Attention is also given to mining methods, production, and the commercial use of corundum as an abrasive, as well as to crystals and colored varieties of mineralogical or gemological interest. The bulletin provides an important late nineteenth-century account of the Appalachian corundum belt and its relationship to the basic magnesian rocks of western North Carolina.

gems, jade, China, chinese jade carving, Chinese lapidary arts, archaic jades, Hetian yu, amphibole jade

Jin Yu Suosui (金玉瑣碎) [Miscellaneous Fragments on Gold and Yu] is a Qing-dynasty collection of miscellaneous observations concerning gold, yu, precious materials, and objects made from them. Of particular gemological interest is its discussion of fei cui (翡翠), including an entry concerning a fei cui mantis (翡翠螳螂), reflecting the terminology, appreciation, and use of fei cui in nineteenth-century China.

gems, jade, Fischer-Book

Bulhões presents the definitive engineering studies for extending the Bahia–São Francisco railway from Alagoinhas toward Juazeiro and Casa Nova, describing the proposed route, topography, rivers, terrain, settlements, engineering difficulties, and natural resources encountered across the interior of Bahia. Prepared principally as a technical report for railway construction, the work includes geographical and geological observations made during surveys of regions that were still imperfectly documented. Its relevance to mineralogical and gemological research lies in observations on the rocks, minerals, and potentially exploitable resources encountered along the proposed railway corridor, providing contemporary evidence for nineteenth-century knowledge of the mineral-producing districts of Bahia.

corundum, ruby, Burma.12, jade, jadeite, fei cui, Burma, gems

An account of the economic resources, arts, manufactures, and commerce of the Shan territories north and east of Ava in Burma (Myanmar), based on Captain S. F. Hannay’s travels and observations, including his visit to Bhamo in January 1836. Hannay describes local products, industries, trade routes, and the important commerce between Bhamo, China, and the lower Irrawaddy. Of particular gemological interest is the reference on p. 11 to precious stones and mineral products among the commodities and resources of the region. The paper provides valuable firsthand evidence for nineteenth-century trade networks linking the mineral- and gem-producing regions of northern Burma with China and the wider Burmese economy.

gems, turquoise, Iran, Persia, Persian turquoise

Farsistan is a literary travel account presenting scenes, observations, and legends from Persia, framed as extracts from the diary of a British traveller. The work combines descriptions of Persian landscapes, cities, customs, society, and historical associations with stories and traditions connected with the places visited. Of particular gemological interest is a section on the turquoise mines (pp. 68–76), providing an early nineteenth-century account of this important Persian gemstone resource.

gems, gemology, lapidary

Sinkankas: An extremely rare work on gemstones that emphasizes practical aspects of lapidary treatment and other matters that would be of value to the tradesman and jewelry maker. It is further remarkable for including a chapter on the methods by which Indian lacquerware is manufactured, which of course has nothing to do with gems. Gemma discusses the origin of gemstones in the first chapter, considering at length Robert Boyle’s statements on the same as given in his Exercitatio de Origine et Viribus Gemmarum, supporting some and disputing others. Other citations and quotations from authorities appear throughout the text. Other topics treated include the magical and curative powers of gemstones, physical properties, color and its enhancement by use of foils, the pricing of gems, the manufacture of doublets, artificially colored and imitation gems, and substitutes. One chapter is devoted to “figures” in stones, that is, clouds or swarms of inclusions, banding, and other markings which resemble human or other figures, shells in fossiliferous limestones, insects in amber, and stars in star stones. All of these are treated soberly as natural manifestations and are not thought to be magical or miraculous in nature as had been done not too long before Gemma’s time. Another chapter treats petrification due to mineralized waters. From the practical viewpoint, this work is especially rich in details on the cutting of gemstones and the equipment required to do so, including the art of gem engraving. Gem-cutting equipment then in use is described in minute detail, as well as a process for classifying raw tripoli to make it useful as a polishing agent. In all respects this admirable, reasoned work deserves greater recognition.