Comprehensive Gem Diagrams Vol 1

Comprehensive Gem Diagrams Vol 1 by Douglas L Hoffman. Published by Aurora Lapidary Books, Spokane, WA, 1967. 1st Edition. Spiral Binding. Oblong. Condition: VG. Small stains on covers, bottom front corner creased, content in excellent condition. 44 Pgs. For the gem cutter. Understanding the Polishing Process. Intro to the Gem. Materials to Start or Practice On. Charts for Brilliant, Emerald Cut, Modified Swiss Cut, French or Caliber Cut, Double French or Caliber Cut, Modified Maga with Vertical and Horizontal Split Mains, Triangular Step Cut, Pentagon Stars, Hexagonal Star, B.-J. Cut, Modified Old Mine, Double Rose, Heart Step Cut, Double Brilliant and Marquis. 2 pages of illustrated principal geometric shapes that most precious & semi-precious gems are cut. Special properties of the Gem. Conversion Table. Transposing Angles. Formula for Transposing the Crown Angle & the Pavilion Angles. Gems that require special Treatment. Gem Material Weights & Measures Chart. Gem Main Angles Chart. Description text copyright 2011 www.BooksForComfort.net. Item ID 25644.