Instructor: Branko Deljanin, B.Sc., GG, FGA, DUG (CGL-GRS Lab, Canada)
Audience: For gemmologists, appraisers, and individuals with trade experience
Location: Brisbane, Australia
Date: Mar 14, 2019
MORNING (9.00am-12.45 pm): EMERALD
Identification of Emeralds is still possible outside a lab because many gemstone properties can be analyzed with portable instruments. We will cover emerald’s identification, recognition of synthetics and understanding the difference between hydrothermal and flux synthetics, as well as the identification of fillers inside cracks. Oiling is an accepted treatment in the trade and today, and almost all emeralds are oiled / clarity enhanced. There is new deposit of emeralds in Ethiopia that has different characteristics than emeralds from Columbia, Brazil or East Africa
- Emerald Sources
- Identification of Fracture Filled Emeralds
- Synthetic Emeralds
- Use of Advanced Instruments in Detection and Certification at Gem Labs
AFTERNOON (13.45am-17.30 pm): JADE
Come to this lecture and workshop and learn how to screen for A jadeite jade (natural colour), B jade (impregnated with polymer) and C jade (dyed) using only UV lamp! You need to also know your limitations using standard instruments in testing jade and when piece of Jadeite or Nephrite Jade in question should be sent to gem laboratory for advanced testing with VIS-NIR and Infrared spectrometers.
- Properties of Jadeite and Nephrite Jade
- Identification of Dyed Jadeite Jade with Microscopy and VIS spectroscopy
- Identification of Polymer Impregnated Jadeite Jade by FTIR Spectroscopy
PRACTICAL LAB SESSION
- Participants we will look at inclusions in emeralds from different localities, detection of oiled and synthetic emeralds with a microscope and loupe.
- Use of microscopy and fluorescence in detecting oiled emeralds and dyed jadeite jade
- Screening for Jade (A, B or C) with UV lamp (PL and Jewelry inspectors