JEFFRIES (David). Traité des diamants et des perles, où l'on considère leur importance, On établit des régles certaines pour en connoître la juste valeur, Et l'on donne la vraie méthode de les tailler. There are also curious Observations, equally useful to Negociants, & to Travelers, & which even interest Politics. Paris: Debure l'aîné, N. Tillard, 1753. - In-8, 195x127: (4 ff.), xxxv, 104 pp. 10 plates. Basane racinée, smooth spine decorated, red edges (early 19th century binding). First French edition dedicated to the Prince de Condé, translated from the second English edition of 1751 by Michel Chappotin de Saint Laurent (1708-1775). This work by a famous 18th-century jeweler is of great importance, and was an authority for over a century, particularly with regard to diamond prices. Pages 81 to 104, following the conclusion, include several tables on the value of these precious stones. The edition is illustrated with a band bearing the coat of arms of the Prince de Condé, engraved by Baquoy after a design by Cochin fils, and 10 plates showing the different sizes of diamonds. Epidermure and stains to binding, lower jaws split, corners dulled. First endpaper missing. Light spotting on the first five leaves and at the edges of pages 41 to 56. Ink stains on false title.