The spiral binding allows the book to lay flat on a workbench, making it a functional tool rather than just a reading material. Other Notable References
An extensive dictionary of technical terms to aid communication between masters, students, and customers. Significance for Professionals spravochnik dlja juvelira
Contains weight conversion charts, chemical preparation formulas, and comprehensive ring size gauges. The spiral binding allows the book to lay
The primary reference matching your request is the by Bruce J. Knuth (often cited in Russian as Брюс Дж. Кнут, "Справочник ювелира" ). Overview of the Handbook chemical preparation formulas
Detailed information on the composition of precious metal alloys and official standards for gold and silver.
While Knuth’s work is the most prominent "Sprovochnik," other valuable guides include:
Справочник ювелира. Брюс Кнут стоимостью 699 руб.