- August 23, 2019 – Screening and ID of Synthetic Diamonds
- Mar 14, 2019 – Natural, Treated and Synthetic Emeralds and Jades
- Mar 13, 2019 – Natural, Treated and Synthetic Rubies and Sapphires
- Jan 19, 2019 – Screening and ID of Synthetic Diamonds
- Oct 6, 2018 – Coloured Diamonds – Identifying of Natural, Treated and Synthetic Diamonds with Standard and Advanced Instruments
- Oct 5, 2018 – Colourless Diamonds – Screening and Identifying of Natural, Treated and Synthetic Diamonds with Standard and Advanced Instruments