The Diploma in Diamond Grading (D.D) is a professional-level course designed for anyone passionate about diamonds and the jewelry industry. This comprehensive 3.5-month fulltime program teaches advanced diamond grading techniques following international standards. Students learn to master the 4Cs of diamonds (Cut, Color, Clarity, and Carat Weight) and develop expertise in identifying lab-grown diamonds, synthetic stones, and treated diamonds.
As India’s premier diamond grading course, GII’s Diploma in Diamond Grading (D.D) combines theoretical knowledge with extensive practical training using real diamonds and advanced laboratory instruments. Graduates of this diamond grading program are qualified to work as professional diamond graders, jewelry appraisers, and quality control specialists in the global gems and jewelry industry.
Since 1971, GII has been India’s leading authority in diamond grading and gemmology education. Our diamond grading course is recognized internationally and follows the same rigorous standards as world-class institutions. Here’s why students choose GII’s Diploma in Diamond Grading (D.D):
GII’s Diploma in Diamond Grading (D.D) curriculum covers all aspects of professional diamond assessment:
Upon successful completion of GII’s Diploma in Diamond Grading (D.D), graduates have excellent career prospects in:
Duration: 3.5 Months Fulltime
Format: Intensive Resident Programme
Schedule: January, April, August batches annually
Teaching Hours: 10:00 AM to 1:00 PM daily
Eligibility: Matriculation or equivalent (Completion of Gemmology D.G preferred)
Medium: English
Certification: Official Diploma in Diamond Grading (D.D) from GII
GII is not just a diamond grading course provider – we are India’s premier research and training institution recognized by the Government of India:
GII’s Diploma in Diamond Grading (D.D) uses a blended learning approach combining classroom instruction with extensive practical training:
Theory Component: Understand diamond chemistry, geological occurrences, cutting principles, optical properties, and market dynamics through interactive classroom sessions.
Practical Component: Apply your knowledge through hands-on sessions in our state-of-the-art laboratory. You’ll grade hundreds of diamonds, learn to use professional grading instruments, and master the 4Cs assessment process.
Examination: Qualify through theory examination (3 hours), practical examination (2 hours), and oral viva (1 hour). Minimum 70% required in theory/oral and 100% in practical.
| 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.; C.I.B.J.O.)
CLARITY GRADING OF POLISHED STCNES : Magnification; Lighting; International grading scales; (G.I.A.; 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
SYLLABUS
(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)
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