A Treatise on Diamonds and Pearls, In Which Their Importance is Considered: And Plain Rules are Exhibited For Ascertaining the Value of Both: And the True Method of Manufacturing Diamonds.
London: Printed by C. and J. Ackers for the Author, 1751.
1st Edition. Hardcover. 8vo - over 7¾ - 9¾" tall. Very Good. Item #002636
8vo (208 x 128 mm). , viii, , 155,  pp., including list of subscribers, 3 letterpress tables, 10 engraved plates and 20 engraved tables. Contemporary calf, rebacked preserving old lettering piece (boards little rubbed, corners scuffed, new endpapers). Little browning and scattered light foxing to text, very light browning to engravings. Provenance: George Piekus(?) (contemporary ink signature at head of title). Very good copy. ----
Ward & Carozzi 1210; Sinkankas 3196 , cf. 3195. - SECOND EDITION of a classic work for the gemstone trade, substantially rewritten and augmented to include a new section on Brazilian diamonds, diamond cutting in India, and alternative methods of valuation. In 1750 Jefferies published the first comprehensive manual in English describing the evaluation of diamonds and pearls according to size and style of cut. While luster and the nearest approximation of spherical perfection were the criteria for valuing pearls, the brilliance of the diamond factored less into its value than did retaining the greatest weight through the cut. "The 'ideal' cut in Jeffries' time is a cushion brilliant, 'old mine' cut, with the pavilion much deeper than employed in modern stones. The proportions and facet patterns are shown in plate 1" (Sinkankas). Other plates show rose cut gems which are graduated in size and weight. The text also explains cutting techniques. Immensely popular and readable, the work went through many editions in English and was translated into several languages.
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