Description
- Overview: Identifying of Natural, Treated and Synthetic Diamonds
with Standard and Advanced Instruments
- Instructor: Branko Deljanin, B.Sc., GG, FGA, DUG (Gemmological Research Industries Inc, Canada)
- Location:EGM, 460 rue Sainte Catherine Ouest, suite 913, Montréal
- Flyer: 2020_10_09-ID_of_COLOURLESS_Diamonds.pdf / 2020_10_10-ID_of_COLOURED_Diamonds.pdf
Day 1
ID of Colourless Diamonds – Treated and Lab-grown
9am-12.30pm: IDENTIFICATION of NATURAL and SYNTHETIC DIAMONDS
- Types of diamonds based on nitrogen and boron content
- Colourless Natural diamonds: sources, characteristics and identification
- Methods of growing HPHT and CVD diamonds
- Inclusions in Natural and Synthetic diamonds
- UV lamp – reaction of different types of diamonds under LW and SW UV light (“PL inspector”)
- CPF (Cross Polarized Filters) method and instrumentation to screen and ID diamond’s origin
PRACTICAL WORKSHOP: Samples of Ia, IIa, IIb, Ib diamonds (natural synthetic origin) are tested with microscopes, mini UV lamp (“PL inspector”) and Mini Polariscope with Portable light
1.30-5.00pm: SCREENING for TREATMENTS of NATURAL and SYNTHETIC DIAMONDS
Clarity and Color Enhancements – unstable (fracture filling and coating)
- Clarity and Color Enhancements – unstable (Fracture Filling and coating),
- Clarity Enhancements – stable (Traditional Lasering, KM Laser drilling)
- Testing and screening methods for treated diamonds with standard instruments
- Post treatments of CVD-grown colorless diamonds (HPHT)
- ID of HPHT-enhanced diamonds using advanced instruments
- ID of mounted synthetic diamonds with EXA instrument and screening instruments
- Problems and solution in identification of melee natural and synthetic diamonds
PRACTICAL WORKSHOP: Colorless Diamonds are tested with microscopes, mini UV lamps, CPF (portable polarioscopes) and portable spectrometer (EXA) for natural, treated or synthetic origin
Day 2
ID of Coloured Diamonds – Treated and Lab-grown
9am-12.30pm: IDENTIFICATION of NATURAL and SYNTHETIC DIAMONDS
- BROWN diamonds: sources/producers, characteristics and identification
- YELLOW and ORANGE diamonds: sources/producers, characteristics, and identification
- GREEN and CHAMELEON diamonds: source/producers, characteristics and identification
- BLUE diamonds: sources/producers, characteristics and identification
- PINK/RED diamonds: sources/producers, characteristics and identification
- Use of Synthetic Diamond ID Kit to separate Colored Natural and Synthetic Diamonds
PRACTICAL WORKSHOP: Microscopy –inclusions for HPHT and CVD synthetics, UV lamp – colours of fluorescence/phosphorescence and Cross Polarized Filters (CPF) patterns for synthetic origin.
1.30-5.00pm: IDENTIFICATION of TREATED NATURAL and SYNTHETIC DIAMONDS
- Clarity and Color Enhancements – unstable (Fracture Filling and coating),
- Clarity Enhancements – stable (Traditional Lasering, KM Laser drilling)
- Processes for colour treatments of diamonds, natural and synthetic
- Color Enhancements – stable (irradiation, annealing, HPHT, multistep treatments)
- Post treatments of HPHT-grown and CVD-grown diamonds (irradiation)
- Identification methods for treated diamonds with advanced instruments at labs
- Grading of Colored diamonds with Munsell chips, masters using GIA and CGL-GRS system
- Certification of treated and synthetic diamonds at gem laboratories
PRACTICAL WORKSHOP: Coloured Diamonds are tested with microscopes, mini UV lamps, (PL inspectors), portable polariscopes, Jewellery Inspectors and portable spectrometer (EXA) for origin
- Portable “Synthetic Diamond ID Kit” (polariscope, lights, PL inspector), EXA will be available
- Certificate of completion will be issued to all participants
