Instructor: Branko Deljanin, B.Sc., GG, FGA, DUG (CGL-GRS Lab, Canada)
Assistant: Elena Deljanin, M.Sc. FGA, Gemmological Research Industries Inc.
Date: Oct 5, 2018
Location: Grand Pacific Palisades Resort & Hotel – 5805 Armada Dr. Carlsbad, CA
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 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 synt. 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 for natural, treated or synthetic origin
- Portable “Synthetic Diamond ID Kit” (loupes, polarioscope, lights, UV lamps) will be available
- Certificate of completion will be issued to all participants