Diploma in Diamond Grading (D.D.)



Duration 3 1/2 Months
New Batch Commences January, April, August, every year. (Tentative Dates)
Timings 10.00 a.m. to 1.00 p.m.
Tuition Fee
Seminar Fee
Lab Deposit (Refundable)
Minimum Qualification Matriculation or equivalent (Completion of Gemmology Course D. G; and/or F.G.A. (London); G.G. (USA); D.Gem. G. (Germany) is preferred).
Medium of Instruction English
Attendance 100% in practicals and 80% in theory is compulsory.
Examinations Theory, Oral and Practical.
Percentage of Passing Minimum 70% in theory/oral examination and 100% in practical examination. Home work assignments and weekly tests will also be taken into account. 90% and above in theory and 100% in practicals qualify for a distinction.
Re-examination Unsuccessful students wishing to re-appear for the next examination will have to pay the examination fee of Rs. 1,000/-.
Certificate On successful completion of the course a Diploma is awarded.


  • CHEMICAL COMPOSITION : Different forms of carbon (graphite, amorphous, diamond).
  • GEOLOGICAL OCCURRENCES AND THEIR HISTORY : Gem and industrial diamond, kimberlite (mines); Alluvial deposits (river beds); Marine deposits (beaches, sea-bed); Meteoric diamonds; Localities like Australia; Borneo; Brazil; India; Sierra Leon, Russia; South Africa; South West Africa, Zaire, Canada etc.
  • EXTRACTION OF DIAMONDS : Crushing, Washing and Screening, Heavy media separator; Grease table, Grease belt, X-ray separation.
  • OPERATION OF THE MARKET : De-Beers consolidated Mines; Diamond Trading Company (D.T.C.); Sights supplied by D.T.C.; Diamond Bourses; Clubs; Operation of the National and International markets. Sources of Rough diamonds : HDC, MMTC, NMDC, Local-resellers, DTC, Open market.
  • OPTICAL PROPERTIES : Single; double and anamolous double refraction, Refractive index; Strain patterns; Dispersion; Absorption spectra; Transparency to Ultra-violet and x-rays; Reflectivity; Luminiscence.
  • SORTING OF ROUGH DIAMONDS : Sorting by Size; Shapes; Colour; Purity.
  • HISTORY OF CUTS : The modern brilliant cut; Variation of the brilliant cut; Principles of diamond cutting; Lustre, brilliance, fire, ideal cuts and proportions; variation from the ideal cut.
  • MANUFACTURING OF DIAMONDS : Grains; Sawing; Cleaving; Bruting; Grinding; Polishing; 4,3,2, point stones; Acidising; Ultrasonic cleaning.
  • COLOUR GRADING OF POLISHED STONES : Lighting standards and magnification; Comparison stones. Colour grading systems (G.I.A.; HRD; Indian; C.I.B.J.O.)
  • CLARITY GRADING OF POLISHED STCNES : Magnification; Lighting; International grading scales; (G.I.A.; HRD; Indian; C.I.B.J.O.); Criteria for grading; Internal blemishes; External defects.
  • GRADING FOR CUT : Spread stones; Lumpy and Fish-eye stones, Proportion scope and proportion analysing, Carat system; Weighing scales; Estimating weight of mounted stones (gauges); Sieves and sieve sizes.Estimating : Table percentage, Pavilion depth, Crown angle, Pavilion angle and Girdle thickness.
  • SYNTHETIC DIAMOND : Synthesis; Artificial colouration; Identification of treated diamond.
  • IDENTIFICATION OF DIAMOND : With 10x only; With Instruments; Type; Classification.
  • DIAMOND SIMULANTS : Gadolinium Gallium Garnet (GGG); Yttrium Aluminium Garnet (YAG); Strontium Titanate; Synthetic Rutile; Synthetic Cubic Zirconia; Synthetic moissanite; Spinet; Sapphire; Zircon; Topaz; Quartz; Paste; Doublets.
  • PRACTICALS : Clarity Grading, Yield estimation and planning of Rough Diamonds, Clarity, Cut and Colour grading of polished diamonds.



  1. Need for international grading
  2. 4 C’s grading as per international standards
  3. Comparative grading systems
  4. Round Brilliant Cut, Parts and Comparative Ideal Cuts
  5. Carat Estimation
  6. Clarity Grading
  7. Colour Grading
  8. Cut Grading Overview – Styles of Cut, Proportions, Polish & Symmetry
  9. Identification

(Applicable for a batch of minimum 2 students)
Duration : 30 hours – 10 days
Days : Mon – Fri.
Timings : 2.30 pm – 5.30 pm (daily 3 hours for 10 days) (Monday to Friday)


  • How and Where are diamonds formed?
  • The characteristics of a diamond.
  • Identification criteria of a diamond.
  • Diamond Journey From Mines to Market
  • Mining and Extraction
  • Big Mining Corporations & Sights
  • World famous diamonds
  • Diamond Crystal Structure and Properties
  • Crystallography
  • Chemical Physical & Optical Properties of a diamond
  • Manufacturing Process
  1. Introduction to rough diamond assorting and its importance
  2. Sorting Systems : The Classification of rough diamonds
    • Gem diamond – Near Gem diamond – Industrial diamond
    • Makeable – Sawable – Cleavables
  3. External Features of a rough diamond :
    • Shapes
    • Twin Crystals
    • Combination of forms
    • Surface Markings
    • Other relevant features
  4. Internal Features of a rough diamond :
    • Inclusions found in diamonds
    • Indian Terms for inclusions
    • Colour
    • Cut / Shape
    • Yield
    • Expected Inclusions after Cutting and Polishing
    • Grade
  5. Planning of Rough Diamonds :
    • RBC
    • Fancy
    • Sawables
    • Cleavables
    • Calculation of yield in rough and price per carat of cut and polished diamonds.
    • Understanding the manufacturing process from rough to finish
  6. Cleavables, Yield, Makeables – Practical
    • Clean
    • Operation Clean
    • Fine Inclusions
    • Medium Inclusions
    • Heavy Inclusions
    • Flat
    • Fancy
    • Rejection
    • Natts
    • Mix Stones
    • Sawables
    • Cleavables


  • Use of diamond scales for weighing rough diamonds.
  • How to use diamond sieves.
  • Pricing Information.
  • How to sort a packet of rough diamonds in a tray.
  • At a Glance to judge, how good or bad is a diamond packet.
  • Understanding a single packet of stones of rough diamonds by the use of light and optivisor.
  • Mixed Parcel : Practical