Diamond Appraisal

Paper Code: 
24DJWT501(B)
Credits: 
4
Contact Hours: 
120.00
Max. Marks: 
100.00
Objective: 
  1. Grade diamonds consistently and accurately using a modern gem microscope and loupe.
  2. Recognize the most common diamond features.
  3. Study of 4 ‘C’s of diamonds, Use of various Gemology instruments.

 

Course Outcomes: 

Course

Learning outcomes

(at course level)

Learning and teaching strategies

Assessment

Strategies

COURSE CODE

COURSE TITLE

24DJWT 501(B)

Diamond Appraisal

 

CO102: Demonstrate the use  of equipments for testing and sorting diamonds and effectively utilize them for identification purposes. Understand the significance of the 4 C's , physical and optical properties that aid in their identification.

CO103: Compile comprehensive practical records detailing plans related to jewellery design across diverse institutional settings and cultivate verbal communication skills to converse effectively with examiners.

CO104: Contribute effectively in course-specific interaction.

 

Approach in teaching: Interactive Practical Sessions , Theme board  , Demonstrations ,Giving tasks, Field practical , inspiration board,  Workshop ,  Laboratory industry visits,  Group and Team work

Learning activities for the students: Self-learning assignments, Effective , Product and Design development

Class test, Semester end examinations, Assignments, Presentation, Individual and group projects

 

120.00
Unit I: 
Uses of various instruments:

Refract meter, Polariscope, Microscope, Spectroscope, Ultraviolet lamp , Hardness pencil           Diamond probe, Chelsa  filter, 10x lens. MM Watch, optimizer, sieve  etc

Properties of Diamond                                                     

The physical properties of diamond and their practical exploitation. Dispersion and ‘fire; total internal reflection; reflectivity and luster;brilliance.

Directional optical properties; durability, specific gravity (SG), electrical properties; thermal properties; wettability.

Non – optical directional properties; ‘grain’ cleavage, differential hardness and crystal from in relation to the crystal structure of diamond; their significance in identification and manufacture.

4 C’s of Diamonds and grading                                    

Cut Grading of diamonds : Ideal proportions for diamond brilliant cut (GIA)

  • Table angle and depth
  • Crown angle and height
  • Girdle thickness and angle
  • Pavilion angle and depth
  • Clarity Grading
  • Types of inclusions in diamond
  • Types of Blemisses
  • Percentages of inclusions and blemisses
  • Clarity chart (GIA)
  • Color Grading
  • Using color master
  • Color scale of diamond (GIA)
  • Carat Weight and size
  • Unit weight of Cents(Ct) carat weight
  • Use of Millimeter Gauge

Color in Diamond                                                                    

  • Grade diamonds in the D-to-Z color range
  • Detect laboratory-grown diamonds, treatments, and stimulants

Clarity grading                                                            

  • Practical clarity grading
  • Internal & External features which effects clarity grading
  • Grading and sorting of diamonds from small size to solitaire
  • Examine various diamond samples with 10x lens and under microscope. Practice of grading them according to grading charts.
Essential Readings: 
  • Verena,P. (2001) Diamond Grading ABC The Manual by Rubin & Son
  • Newman,R. (2003) Diamond Ring:Buying Guide International Jewellery  Publications,U.S.; 4th Revised edition
  • Hall, J. (2003) The Crystal Bible : A Definitive Guide to Crystals
  • Cleef,V. (2016) The Art & Science of Gems ‎ Editions Xavier Barral
Academic Year: 
2024-2025
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