Rough Diamond Grading

Course Rough Diamond Grading and Evaluation

(Duration: 2 weeks)

Course Objectives

This course prepares the student to become proficient in every technique involved in the buying, selling, manufacture and grading of diamonds

To teach the student how to sort and evaluate diamonds both in the rough and polished state and how color, imperfection, shape and proportions affect prices

Course Outline
  • How to use a loupe correctly
  • Gem and near gem
  • Different quality shapes colour sizing and sieving
  • Great precision of what is SAWABLE, MAKEABLES, MACCLES, CLIVAGE, REJECTIONS, FLATS and BOART with its qualities and colours
  • Cullinan – De Beers mine – surface -underground tour
  • Visits to various alluvial diggings
  • How to use the Rapaport Diamond Price List. And the international Rapaport diamond price structure
  • How to look for and identify the grain in a sawed (four point) diamond
  • How to look for and identify the crystal symmetry, axis, plane, form and habit of diamond crystals
  • Moissanite identification
  • The study of impurity centres in rough diamond crystals, their cause and effect
  • How to select diamonds for fancy shapes, determining their ultimate form when in the rough
  • How to determine colour in diamonds, both natural and artificial, and its effect on buying and selling
  • How to select rough diamonds for purity, colour, size, shape and unusual qualities
  • How to determine whether a whole rough diamond is to be cleaved, sawed or remain whole
  • The process used in cutting and shaping elliptical diamonds such as , ovals,marquises pear shaped diamonds, etc
  • Classification of rough gems and industrial diamonds
  • How to use the Rapaport Diamond Price List and the international diamond price structure
  • Moissanite identification
  • Reading your GIA reports (Gemological Institute of America)
  • How to determine table, crown angle, pavilion and depth
  • Diamond grading systehysical and optical properties: how to clarity grade, and how to plot clarity characteristics


Course Costs
  • South African citizen: R11500
  • Non-South African citizen: USD $1200
  • A 50% non refundable deposit fee is payable on booking a course
Commencement The Rough Diamond Evaluation and Grading Courses will be run as follows:

Join the course enroll below: